The Student, and Intellectual Observer, Volumen3Groombridge and Sons, 1869 |
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Página 59
... metal , and colours the discharge . With a coil of sufficient power , the effects are exceedingly brilliant . The composition of the light thus obtained , is found , when examined by the spectroscope , to be more complicated than when ...
... metal , and colours the discharge . With a coil of sufficient power , the effects are exceedingly brilliant . The composition of the light thus obtained , is found , when examined by the spectroscope , to be more complicated than when ...
Página 60
... metals it may not be the same . When concentrated solutions are employed , the luminous effects are very striking , especially when chlorides are used . The dis- charges are of a splendid red , with chloride of strontium ; orange , with ...
... metals it may not be the same . When concentrated solutions are employed , the luminous effects are very striking , especially when chlorides are used . The dis- charges are of a splendid red , with chloride of strontium ; orange , with ...
Página 65
... METALS FROM THE DETRIMENTAL INFLUENCE OF SEA WATER . - Paint for the protection of iron and other metals from the destructive influence of sea water , and for the prevention of fouling is made as follows : - 30 parts of quicksilver 7 of ...
... METALS FROM THE DETRIMENTAL INFLUENCE OF SEA WATER . - Paint for the protection of iron and other metals from the destructive influence of sea water , and for the prevention of fouling is made as follows : - 30 parts of quicksilver 7 of ...
Página 68
... metal - of course , im- mersed in the water - which is connected with the metal of the boiler . The boiler forms one electrode , the suspended plate the other . The size of the metal plate is so proportioned to that of the boiler , that ...
... metal - of course , im- mersed in the water - which is connected with the metal of the boiler . The boiler forms one electrode , the suspended plate the other . The size of the metal plate is so proportioned to that of the boiler , that ...
Página 70
... metal , and in these are placed the necessary ingredients for evolving the gases , as well as the substances to be preserved . ELIMINATING NITROGEN IN WORKING BLAST - FURNACES , GAS - GENERATORS , ETC. - This process , which is intended ...
... metal , and in these are placed the necessary ingredients for evolving the gases , as well as the substances to be preserved . ELIMINATING NITROGEN IN WORKING BLAST - FURNACES , GAS - GENERATORS , ETC. - This process , which is intended ...
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acid Actinozoa Alcyonaria animal Annelides antennæ appears Barbel barrow beads belonging body branchiæ bright bristles called carbonic carbonic acid character cilia circle Coccoliths colour comet composed considerable consists copal corals costume crater curious described diameter disc distance distinct dorsal dorsal fin doubt dress earth earth-worm elytra exhibit existence feet feudal fifteenth century fish France Fritz Müller genus head heat Herschel hydrogen III.-NO illumination inches insects John Herschel known ladies length less light matter means Ménagier de Paris metal Milky month Moon mouth nearly nebulæ nucleolus nucleus objects observed organs palladium period peristome Plate polymorphus polypes portion present produced remarkable represented resemblance resin round says seen segments setæ side sidereal system solar species specimens stars Stein Stentors stones substance surface tail telescope temperature tint tion tissues tube vegetable ventral vessel worms Zoantharia
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Página 426 - For, to say nothing of half the birds, and some quadrupeds which are almost entirely supported by them, worms seem to be the great promoters of vegetation, which would proceed but lamely without them, by boring, perforating, and loosening the soil, and rendering it pervious to rains and the fibres of plants, by drawing straws and stalks of leaves and twigs into it ; and, most of all, by throwing up such infinite numbers of lumps of earth called worm-casts, which, being their excrement, is a fine...
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Página 425 - Earth-worms, though in appearance a small and despicable link in the chain of Nature, yet, if lost, would make a lamentable chasm. For, to say nothing of half the birds, and some quadrupeds, which are almost entirely supported by them, worms seem to be...
Página 427 - On carefully examining between the blades of grass in the fields above described, the author found that there was scarcely a space of two inches square without a little heap of the cylindrical castings of worms.
Página 427 - ... which cinders had been spread out only half a year before, Mr. Darwin actually saw the castings of the worms heaped on the smaller fragments. Nor is the agency so trivial as it at first might be thought, the great number of earth-worms (as every one must be aware who has ever dug in a grass field) making up for the insignificant quantity of work which each performs.
Página 166 - I cannot give you a more exact description of its figure than by comparing it to that of a pine-tree, for it shot up to a great height in the form of a trunk, which extended itself at the top into a sort of branches...
Página 266 - ... and the result of the same general laws, which have been the groundwork through natural selection of the formation of the most perfectly adapted animals in the world, man included, were intentionally and specially guided. However much we may wish it, we can hardly follow Professor Asa Gray in his belief that " variation has been led along certain beneficial lines," like a stream "along definite and useful lines of irrigation.
Página 144 - That the alloy contains about 20 volumes of palladium united with a volume of hydrogenium ; and that the density of the latter is about 2, a little higher than magnesium to which hydrogenium may be supposed to bear some analogy. That hydrogenium has a certain amount of tenacity, and possesses the electrical conductivity of a metal. And finally, that hydrogenium takes its place among magnetic metals. The latter fact may have its bearing upon the appearance of hydrogenium in meteoric iron, in association...
Página 74 - cold area " were to be raised above the surface, so that the deposit at present in progress upon its bottom should become the subject of examination by some Geologist of the future, he would find this to consist of a barren Sandstone, including fragments of older rocks, the scanty Fauna of which would in great degree bear a Boreal character (§ 11); whilst if a portion of our "warm area" were elevated at the same time with the