Imágenes de páginas
PDF
EPUB
[ocr errors]

spectres were so great that it is no wonder that now and then the person should have died at or near the moment, we ought to expect a much larger proportion of cases in which the spectre should come at the moment of the death of one or another of all the cluster who are closely connected with the original of the spectre." (This is not very distinct: any wrong spectre, with or without close connection with any particular moribund, would seem to serve De Morgan's purpose in this argument equally well. He seems to insist, however, on the factundoubtedly such- that if spectres were commonly appearing, without reference to the deaths of individuals, cases should happen pretty frequently where a spectre appears which is not that of a person then dying, but of some near relative. I feel by no means sure, however, that I have rightly caught De Morgan's meaning.) "But this," he proceeds, "is, we know, almost without example. It remains then, for all, who speculate at all, to look upon the asserted phenomenon, think what they may of it, the thing which is to be explained, as a connection in time of the death, and the simultaneous appearance of the dead. Any person the least used to the theory of probabilities will see that purely casual coincidence, the wrong spectre being comparatively so rare that it may be said never to occur, is not within the rational field of possibility."

mind is not so preoccupied. If we admit this and I conceive that there can be very little doubt on the point- -we can dispose very readily of the argument from coincidence, advanced by those who believe that the spirits of the dead sometimes come visibly into the presence of the living. I present this argument as urged in an analogous case (that of visions at the moment of death) by a late eminent mathematician, whose belief in the possibility at least of many things which are commonly regarded as superstitions was so well known that no apology need here be made for touching on the subject. After speaking on the general subject of coincidences, De Morgan thus, in language less simple than he commonly employs, presents the argument for spectral apparitions (at the moment of the death of the person so appearing): "The great ghost-paradox and its theory of coincidence will rise to the surface in the mind of everyone. But the use of the word coincidence is here at variance with its common meaning. When A is constantly happening, and also B, the occurrence of A and B at the same moment is the mere coincidence which may be casualty." (That is, this is a coincidence of the common kind.) "But the case before us is that A is constantly happening" (here by A, De Morgan means a death, as he explains further on, but the explanation should come in at this point) "while B" (the spectral ap- I have quoted this argument because pearance of the person who dies), "when it applies equally well to the case of it does happen, almost always happens spectral appearances after death. The with A, and very rarely without it. That right spectre is always seen, so far as is is to say, such is the phenomenon assert- known, and it appears always on a suited; and all who rationally refer it to cas-able occasion (at least, an occasion as ualty affirm that B is happening very often nearly suitable as the case permits). as well as A, but that it is not thought It must be admitted, however, that the worthy of being recorded except when A explanation does not cover the facts of is simultaneous." I must venture to ex- all ghost-stories. There are some narrapress my dissent from this statement: it tives which, if accepted in all their deseems to me incredible that any person tails, appear to admit of no explanation would, as De Morgan asserts, rationally other than that which refers the events affirm that spectral appearances are" very described to supernatural causes. But often" seen. "In talking of this sub-it must not be forgotten that these narject," he proceeds, "it is necessary to ratives have come in every instance from put out of the question all who play fast believers in ghosts and spirits; and withand loose with their secret convictions: out questioning the veracity of particular these had better give us a reason, when narrators, we may yet not unfairly point they feel internal pressure for explana- out that it is not absolutely impossible tion, that there is no weathercock_at that at some stage or other, either in the Kilve this would do for all cases. But events related or in the handing down of persons of real inquiry will see that, first, the story, some degree of deception may experience does not bear out the asserted have come in. Tricks have been played frequency of the spectre, without the al- in these matters, beyond all possibility leged coincidence of death; and second- of question. Untruths have been told ly, that if the crowd of purely casual also. The person who doubts a

narra

be found on the parchment, was also given, and was followed by the signature Baldazzarini. Father and son then set to work to search for this hidden scroll, and after some two hours' close examination found, in a narrow slit, a piece of old parchment about eleven inches by three, containing, in very old writing, nearly the same words which M. Bach had written, and signed - Henry. This parchment was taken to the Bibliothèque Impériale, and submitted to experienced antiquarians, and was pronounced to be an undoubtedly genuine autograph of Henry III.

tive of the marvellous is not bound to say where he suspects that some mistake has been made, some deception practised, some statement made which is not strictly veracious. He may not wish to say, or he may even be very far from believing, that the narrator is a trifle foolish or not quite honest. He may put faith in the persons cited as authorities for the narrative; and he may even carry his faith, as well in the sense as in the honesty of the persons concerned, a step or two farther. Yet he may still find room for doubt. Or again, he may have very little faith, and very ample room for doubt, and yet may have valid reasons for not wishing "This is the story," says Prof. Walto state as much. Persons who tell mar-lace, and proceeds to dwell on the care vellous stories ought not to press too earnestly for their auditor's opinion. It is neither fair nor wise.

with which Mr. Owen, who narrates it (in The Debatable Land between this World and the Next), had examined all the deAs an instance of a story which has tails. "Not content with ascertaining been unwisely insisted upon by believers these facts at first hand, and obtaining in the supernatural, I take the marvel- photographs of the spinet and parchlous narrative of M. Bach and the old ment"()" of both of which he gives spinet. As given in outline by Profes- good representations, M. Owen sets himsor Wallace, it runs thus:-"M. Leon self to hunt up historical confirmation of Bach purchased at an old curiosity shop the story, and after much research and in Paris a very ancient but beautiful many failures, he finds that Baltasarini spinet as a present to his father (a great- was an Italian musician, who came to grandson of Bach, the great composer), a France in 1577, and was in great favour musical amateur. The next night the with Henry III.; that the King was paselder Bach dreamt that he saw a hand- sionately attached to Marie de Cleves, some young man, dressed in old court who became wife of the Prince de Condé, costume, who told him that the spinet had and that several of the allusions to been given to him by his master King her in the verses corresponded to what Henry. He then said he would play on was known of her history. Other miit an air, with words composed by the nuter details were found to be historically King, in memory of a lady he had greatly accurate." (In other words "the bricks loved; he did so, and M. Bach woke in are alive this day to testify it; therefore, tears, touched by the pathos of the song. deny it not.") "Mr. Owen also carefully He went to sleep again, and on waking discusses the nature of the evidence, the in the morning was amazed to find on his character of the person concerned, and bed a sheet of paper, on which were writ- the possibility of deception. M. Bach is ten in very old characters, both words an old man of high character; and to and music of the song he had heard in suppose that he suddenly and without his dreams. It was said to be by Henry conceivable motives planned and carried III., and the date inscribed on the spinet out a most elaborate and complicated imwas a few years earlier. M. Bach, com- posture, is to suppose what is wholly inpletely puzzled, showed the music to his credible." (That is, we must not suppose friends, and among them were some so because we cannot suppose so.) "Mr. spiritualists, from whom he heard, for Owen shows further that the circumstanthe first time, their interpretation of the ces are such that M. Bach could not have phenomena. Now comes the most won- been an impostor even had he been so inderful part of the history. M. Bach be-clined, and concludes by remarking, 'I do came himself a writing medium; and through his hand was written involuntarily a statement that inside the spinet, in a secret niche near the key-board was a parchment, nailed in the case, containing the lines written by King Henry when he gave the instrument to his musician. The four-line stanza, which it was said would

not think dispassionate readers will accept such violent improbabilities. But if not, what interesting suggestions touching spirit-intercourse and spirit-identity connect themselves with this simple narrative of M. Bach's spinet!?"?

Here is a story which to most readers, I venture to say, appears absurd on the

face of it, suggesting not "interesting,' but utterly ludicrous "ideas of spirit intercourse;" yet we are to believe it, or else indicate exactly how our doubts are divided between Mr. Owen himself (who may have been somewhat misled by his evidence), the Bachs, father and son, the spiritualist friends who instructed M. Bach how to become "a writing medium," and so on.

Again, we are to believe all such stories unless we are prepared with an explanation of every circumstance. It seems to me that it would be as reasonable for a person who had witnessed some ingenious conjuring tricks to insist that they should be regarded as supernatural, unless his hearers were prepared to explain the exact way in which they had been managed. Indeed, the stress laid by the superstitious on narratives such as those related by Mr. Owen, is altogether unwarrantable in the presence of all that is known about the nature and the laws of evidence. In works like Mr. Owen's the author is witness, judge, and advocate (especially advocate) in one. Those who do not agree with him have not only no power of cross-examining, but they commonly have neither time nor inclination to obtain specific evidence on their side of the question. It requires indeed some considerable degree of faith in the supernatural to undertake the deliberate examination of the evidence adduced for ghost stories, by which I mean, not the study of the story as related, but the actual questioning of the persons concerned, as well as an examination of the scene and all the circumstances of the event. Thus I cannot see any force in the following remarks by Professor Wallace : "How is such evidence as this," he says, speaking of one of Owen's stories, "refuted or explained away? Scores, and even hundreds of equally attested facts are on record, but no attempt is made to explain them. They are simply ignored, and in many cases admitted to be inexplicable. Yet this is not quite satisfactory, as any reader of Mr. Owen's book will be inclined to admit. Punch once made a Yankee debtor say

This debt I have repudiated long ago; 'Tis therefore settled. Yet this Britisher Keeps for repayment worriting me still! So our philosophers declare that they have long ago decided these ghost stories to be all delusions; therefore they need only be ignored; and they feel much 'worrited, that fresh evidence should be

adduced, and fresh converts made, some of whom are so unreasonable as to ask for a new trial, on the ground that the former verdict was contrary to the evidence."

All this affords excellent reason why the "converts" should not be ridiculed for their belief; but something more to the purpose must be urged before "the philosophers" can be expected to devote very much of their time to the inquiry suggested. It ought to be shown that the well-being of the human race is to some important degree concerned in the matter, whereas the trivial nature of all ghostly conduct hitherto recorded is admitted even by "converts." It ought to be observed that the principles of scientific research can be applied to this inquiry; whereas before spirits were in vogue the contrary was absolutely the case, while it is scarcely going too far to say that even the behaviour of spirits is to be tested only by "converts," and in the dark. It ought, lastly, to be shown that the "scores and even hundreds" of wellattested facts, admittedly singular, and even, let us say, admittedly inexplicable, are not more in number than the singular and seemingly inexplicable facts likely to occur (by mere casualty) among the millions of millions of events which are continually occurring; but this is very far from having been as yet demonstrated; on the contrary, when we consider the scores and hundreds, and even thousands of facts which, though they have been explained, yet seemed for awhile (and might have remained for ever) inexplicable, the wonder rather is that not a few books like Mr. Owen's, but whole libraries of books, have not been filled with the records of even more singular and inexplicable events.

From The Academy.

THE PHYSICAL EFFECTS OF FOREST UPON ATMOSPHERE AND SOIL.*

"THE welfare and the progress of a country depend to a certain extent on the amount of forest which it contains." Such a statement appears strange enough to us here at home, but its truth has at last been recognized at the India Office, by the foundation of a forest department,

Die physikalischen Einwirkungen des Waldes auf Luft und Boden, und seine klimatologische und hy gienische Bedeutung, begründet durch die Beobachtun gen der Forstl. Meteorologischen Stationen in Ba yern. Dr. Ernst Ebermayer. Aschaffenburg: Krebs.

the cadets of which have been sent for training to the continental schools of forestry. The present volume is the outcome of the first five years' results obtained at the stations in Bavaria established under the superintendence of Prof. Fbermayer, of the Forest School of Aschaffenburg.

Many of the statements in the book depend on the observations of only three years, or even of a single year, but our author states his conviction that the main features of the subject can be elicited with sufficient accuracy for each station in a period of observation as short as that mentioned, and that the instrument can then with advantage be removed to a fresh station.

It must be remembered that the difficulties of the observations are very exceptional, as the mounting a ladder to read a thermometer in the top of a tree is not an agreeable duty to perform in all weathers, and so too great a tax must not be laid | upon the officials to whom the instruments are entrusted.

The subjects investigated in the open country are, speaking generally, temperature in shade and sun, earth temperature, hygrometry, rainfall and evaporation. To these are added, in the forest, observations made in the head of the tree and on the temperature of the heart of the tree itself at various heights.

The first stations were established in 1867, and the total number in Bavaria is seven, distributed over the country. To these is added one in Bohemia on the property of a nobleman. The outfit of each station cost about £40, and the yearly cost of maintenance is one-half that sum. Some of the apparatus used deserves special notice, especially the vaporimeters for open water surfaces and for soil, and the arrangements for determining the amount of infiltrated water.

The subject is, comparatively speaking, so new and the variety of observations so great that the author for the most part contents himself with simply enumerating his results without attempting to deal with the subject as a whole. We shall therefore confine our remarks to an account of some of the more important subjects touched upon in the volume.

Earth Temperature comes first, as being the most important element for vegetable life. It is found at the various depths, 0-4 feet, to be lower, to the extent of twenty-one per cent., on the mean of the year, in the forest than in the open, and this is pre-eminently the case in

spring and summer, while in winter the difference is scarcely traceable. This shows us that the effect of clearings is mainly felt in summer, and that it is greater the warmer is the climate. Diurnal range is felt only to the depth of three feet, and it is materially diminished by the presence of forest. The annual range of temperature is less in the forest than outside it, but the periods of the two phenomena do not agree very closely.

The effect of wood on Air Temperature is similar to that just described, but the extent of the influence is only about half that exerted on earth temperature: the differences between the temperature above and underground thereby produced are of great importance as affecting the aëration of the soil, and thereby the nutrition of the roots. The observations as regards height show furthermore that the temperature rises with the height at least up to the level of thirty or forty feet. When we remember that the diurnal range is reduced by the presence of wood we see how an alternating vertical circulation, like that assigned as a cause for land and sea breezes, is set on foot, the existence of which, as our author amusingly states, may be proved by watching the smoke of a cigar.

The tendency of forests is found to be to moderate the extremes of temperature, and so to render the climate less severe. This is a direct contradiction to the popular idea that the cutting away of our forests has made our climate less extreme than it used to be.

The observations on Tree Temperature are very valuable, as by them we are able to determine far more simply than by any other means the total amount of heat required by each tree for its development. These experiments also throw great light on the causes which regulate the flow of the sap.

Becquerel's idea that trees warm the air is distinctly controverted by the results under discussion, which show that the temperature of the trees themselves is generally below that of the air.

In the winter the trees are colder than the soil, and in summer warmer: hence we see that the main seat of activity is in the roots in winter and in the branches in summer.

As concerns Vapour Prof. Ebermayer finds that the existence of timber produces no difference in the absolute quantity present in the air, but that owing to the depression of temperature the Fraction of Saturation is raised by the forest.

to the contour of the country itself. The influence of forests on rain is however much greater among mountains than in the plains; it is also greater in hot climates than in cold, and in summer than in winter.

The actual amount of rain which is collected on the ground in a forest is about three quarters of that which falls on the cleared land outside. The quantity in

Evaporation from a free water surface is about sixty-four per cent. less in the forest than in the open, and morever it is far more ruled by the motion of the air than by the temperature. Hence we see the importance to young plantations which are likely to suffer from drought of leaving belts of trees to shelter them. Anything which breaks the force of the wind retains moisture in the soil. The evaporation from the soil is, how-defect does not all remain in the tree ever, a very different thing from that from a free water surface, and in considering it we arrive at the valuable result that the brushwood, leaves, &c., which cover the ground exert quite as great an influence in retarding it as the forest itself.

tops, as much runs down the stem; but it is found that the proportion retained by the foliage differs with the different character of the wood; thus it is greater with conifers (Nadelholz) than with leaf trees (Laubholz), and of all trees Scotch fir retains the most.

It is found that for every hundred cubic inches of water evaporated from The usual proportion between evaporathe soil, in the open, the ground in a for- tion from a free water surface and rainest, cleared of brushwood, &c., gives off fall on the same surface during the only thirty-eight, and the uncleared year is that the former rather exceeds ground, in its natural condition, give off the latter. The evaporation from the only fifteen cubic inches. Hence we see ground is very different from that from how immediately the water supply de-a water surface, and so, as regards the pends on the wood, and the fact confirms the old observation that in new and thriving settlements the springs dry up in proportion as the land is cleared.

stored up in the ground against periods of drought falls below that in open land, owing to the fact that so much of the rain is intercepted before it reaches the ground.

soil of a wood, the proportion above mentioned is reversed, for the diminution of evaporation is less than that of rainfall. If however the wood be cleared of brushIt is a self-evident proposition that wood, leaves, &c., the rate of evaporation plants require rain, but Hellriegel has from the soil is seriously increased, and shown how much they require : accord-in fact in such a case the amount of water ing to him every pound of barley requires the supply of seven hundred lbs. of water during the period it is in the ground. Trees require a different quantity from corn, and in addition they have a very great effect in draining the land, for it is The work concludes with some refound that land from off which the tim- marks on ozone, and on the hygienic efber has been entirely felled often becomes fects of forests, and with some practical swampy, and only dries again when the applications of the results obtained to the new plantations spring up. This fact explanation of the causes of certain disshows us that trees exert a constant de- eases which are very destructive to young mand on the moisture of the soil, so that fir plantations. Copious tables are apover-drainage of the ground must seri-pended, with an atlas of graphical repreously affect their growth. sentations of the results.

It is then a most important matter to Our hearty thanks are due to Prof. determine the effect of forest on moisture. | Ebermayer for the work, which contains, Prof. Ebermayer's experiments lead him as will be seen, a mass of carefully colto the view that the idea of the effect usually attributed to wood in increasing rainfall is not fully justified, and that much which has been held to be due to the timber in a country is really much more due

lected and important data of the highest value to the scientific meteorologist and botanist, as well as to the practical forester and the landscape gardener.

« AnteriorContinuar »