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plicable to the theory of the mutual perturbations of Uranus and Neptune. The successive periods of conjunction and opposition, occurring at intervals of eighty-four years, that is, in about the time of revolution of Uranus, this planet is always at the same part of its orbit when it is most affected by the action of Neptune. The action of Neptune, consequently, assumes a fixed, permanent, undisturbed character, so that it can hardly be recognized as perturbation by the practical observer. It is far otherwise with the ordinary class of perturbations, where the place of greatest disturbance varies from point to point of the orbit; thus the place of greatest disturbance in the case of the theoretical planet would not have remained stationary, but have varied 80° upon the orbit of Uranus at each successive conjunction and opposition ; so that the disturbance could not in this case be disguised to any great extent under the fixed laws of ordinary elliptic motion. In the case of Neptune, its action on Uranus is to be detected in the comparatively small differences between its character and that of an elliptic motion, and the difference between the influence at opposition and that at conjunction. In undertaking, therefore, anew the solution of the problem of the perturbations of Uranus, with the assumption of the actual period of Neptune, instead of that adopted in the former theories, I found at once that I could not profit by the previous researches of Adams and Leverrier. The problem now presented, instead of being of the usual character, assumed a differential form by the disguise of the primary perturbations under the aspect of elliptic motions, and the whole ques. tion now rested upon the secondary perturbations, which were comparatively unimportant in the previous theories.'

“There is a popular notion, which hardly deserves to be refuted before a scientific body, that the less distance of Neptune than the planet of geometry is compensated by its smaller mass, so that its action upon Uranus is the same with that which was predicted. But the fallacy of this view of the subject, which takes no cognizance of the chief difficulty of the problem arising from the unknown orbit of Uranus, is obvious enough from a simple inspection of the following table, in which no one can fail to perceive the difference between the actions of the two planets. The second column of this table, which comprises the action of the theoretical planet of Adams's second hypothesis, is copied from page 27 of Adams's memoir.

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+ 150

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3421 1797, + 163

– 1816
- 118

3377 1792, # 181 1967 1835, - 96 3235 1787,


2210 1829 2964 1782,

2504 1824, - 44


3225 1819, - 13 2393


- 3431 1813, + 35 - 2072 1715,

- 1845 1808, + 83 - 1881

- 2947 1803,

- 1781 “ The difference in the action of the two planets is just balanced by the difference in the corrections of the elements of Uranus in the two theories. The corrections are given in the following table.

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Corrections in the Elements of the Orbit of Uranus of the
Mean Annu- Mean Longitude of

a Longitude of al Motion Distance. Epoch,

From the Theory of


Longitude of Eccentricity.


Adams's second hypo

thetical planet, : -0.17846 +0.000148 – 4762 +0.0001954 + 1010.5 Neptune with Peirce's

computed mass, . : -1.13560 +0.000942 +2575.4 – 0.0003626 + 8252.4 Neptune with Struve's

mass, .....1-0.10387 +0.000086 +3511.7 -0.00055101 +11171.3

Mr. Bond communicated an account of his recent observations on the great nebula surrounding of Orionis ; with drawings illustrating its appearance as seen through the Cambridge refractor. Of the resolution of parts of the nebula Mr. Bond expresses himself with confidence. Several new stars are added in the vicinity of the Trapezium, and the connection of the nebulous districts about C and · Orionis with the great nebula conclusively established.

The paper was referred for publication in the Memoirs, as was also a communication from Mr. G. P. Bond, on “Some Methods of Computing the Ratio of the Distances of a Comet from the Earth.”

Professor Agassiz made some remarks on the distinctive characters of the family of Cyprinoids or suckers, as distinguished from the Cyprinodons, and illustrated the remarkable difference between the sexes, which had caused the establishment of a large number of nominal species.

From the Royale o tre partie


FROM NOVEMBER, 1847, TO MAY, 1848. Mémoires de la Société Ethnologique de Paris. Tom. I. and IJ. 1841 – 45. 8vo. From the Ethnological Society.

Bulletins de l'Académie Royale des Sciences de Bruxelles. Tom. XII. 2me partie. Tom. XIII. and XIV. 1re partie. 8vo. Bruxelles, 1845 - 47. From the Brussels Academy

Mémoires Couronnées et Mémoires de Savants Étrangers, publiés par l'Acad. Roy. des Sciences, etc., de Bruxelles. Tom. XIX., XX., XXI. 4to. 1845 - 46. From the Brussels Academy.

Nouveaux Mémoires de l'Acad. Royale des Sciences, etc., de Bruxelles. Tom. XIX. and XX. 4to. 1845 – 7. From the Brussels Academy.

Annales de l'Observatoire Royal de Bruxelles. Tom. V. 4to. 1846. From the Brussels Academy.

A. Quetelet. Observations de Phénomènes Périodiques. 4to. pamph. Bruxelles, 1846. From the Author.

A. Quetelet. Annuaire de l'Observatoire Royal de Bruxelles. Ann. 13me et 14m 12mo. pamph. From the Brussels Observatory.

Annuaire de l'Académie Royale des Sciences, etc., de Bruxelles. Ann. 12me et 13me 12mo. pamph. 1846 – 47. From the Academy.

Francis C. Gray. Prison Discipline in America. 8vo. pamph. Boston, 1847. From the Author. · Abhandlungen der Königlichen Preuss. Akademie der Wissenschaften zu Berlin. Jahr. 1845. 4to. 1847. From the Berlin Academy.

Monatsbericht der Königl. Preuss. Akad. Wissenschaften zu Berlin. Jan. - Dec. 1847. 8vo. From the Berlin Academy.

Flora Batava : Afbeelding en Beschrijzing van Nederlandsche Gewassen, door Jan Kops. Afgebuld on der opzigt van J. C. Sepp en Zoon. Aflev. 144, 145, 146. Amsterdam. From the Author.

Verhandlungen der Kaiserlich-Russischen Mineralogischen Gesellschaft zu St. Petersburg. Jahr. 1845 – 46. 8vo. pamph. 1846. From the Society.

Sir J. F. W. Herschel. Notice of the Life, Researches, and Discoveries of F. W. Bessel. From Rev. R. Sheepshanks.

Sir J. F. W. Herschel. Memoir of Francis Baily. 8vo. pamph. London, 1845. From Rev. R. Sheepshanks.

Portrait of Francis Baily, Esq. London, 1847. From Rev. R. Sheepshanks.

Usher Parsons, M. D. Physician for Ships. 3d ed. Boston, 1842. - Boylston Prize Essays. Boston, 1839. — Directions for making Anatomical Preparations. Philadelphia, 1834. — Remarks on Quarantine Systems. Boston, 1836. — Lecture on the Connection and Reciprocal Influence between the Brain and the Stomach. Providence, 1841. – Spinal Diseases : their Causes and Treatment. Boston, 1843. — 8vo. pamphlets. From the Author.

Frans. Ritter von Hauer. Die Cephalopoden des Salzkammergutes, aus der Sammlung seiner Durchlaucht des Fürsten von Metternich, etc. 4to. Vienna, 1846. From Prince Metternich.

J. D. Dana. On Certain Laws of Cohesive Attraction, as exemplified in a Crystal of Snow. 8vo. pamph. (Extr. from Amer. Jour. Sci.) From the Author.

Twenty-seventh Annual Report of the Mercantile Library Associa. tion of New York. New York, Jan. 1848. 8vo. From the Directors.

A. D. Bache. Report of Alexander D. Bache, Superintendent of the Coast Survey, showing the Progress of that Work for the Year ending October, 1847. From the Author.

Transactions of the American Philosophical Society. Vol. X., Part I. Philadelphia, 1847. From the Society.

Prof. Hausmann. Studien des Göttingischen Vereins Bergmannischer Freunde. 1833 – 44. 6 vols. 12mo. From the Author.

Geo. P. Marshall. Occultations Visible in the United States during 1848. Philadelphia, 1848. From the Author.

Magnetical and Meteorological Observations at St. Helena, during 1840, 1841, 1842, and 1843. Vol. I. 4to. London, 1847. From the British Government.

Prof. Silliman. American Journal of Science and Arts, for Jan., March, and May, 1848. From the Editors.

F. A. W. Miguel. Illustrationes Piperacearum. Rotterdam, 1844. From. Acad. Nat. Cur. Bonn and Breslau.

Abhandlungen der Phil.-Philol. Classe der Königl. Bayerschen Akad. der Wissenschaften. Band. III. and IV., Abth. 1, 2. 1840 - 46.

– Historisch. Classe. Band. III, and IV., Abth. 1, 2. 1841 – 45. — 4to. Munich. From the Royal Bavarian Academy.

Gelehrte Anzeigen. (Bayersch. Akad.) Bände VI. - XXI. Munich, 1838 – 45. From the Royal Bavarian Academy.

Annual Report of the Trustees of the State Library, New York, 1848. 8vo. Albany. From the Trustees.

Bulletin de la Société Impériale des Naturalistes de Moscou. No. III. 8vo. Moscow, 1846. From the Society.

G. Fischer de Waldheim. Spicilegium Entomographiæ Rossicæ. (Extr. Bull. Imp. Soc. Natur. Mosc. 1844.) From the Author.

G. Fischer de Waldheim. Entomographie de la Russie. IVme Vol. (Orthoptères). 4to. Moscow, 1846. From the Author.

G. Fischer de Waldheim. Notice sur quelques Sauriens Fossiles de Moscou. 4to. pamph. From the Author.

La Lega Italiana, Giornale Pol. Econ. Scien. e Litterario. Nos. 1- 4. Genoa. From the Editor.

Map of the Mineral Lands adjacent to Lake Superior, ceded to the United States by the Treaty of 1842 with the Chippewas. From the War Department.

Joseph Leidy, M. D. Researches into the Comparative Structure of the Liver (with 3 plates). - On some Bodies in the Boa Constrictor resembling the Pacinian Corpuscules. — On a New Genus and Species of Fossil Ruminantia. - On a New Fossil Genus and Species of Ruminantoid Pachydermata. — 8vo. pamphlets. From the Author.

'AQ10 T ó Bovhos. Universal Destruction of Aboriginal Races by Colonizing Nations, and eventually of the New Zealanders. London, 1847. pamph. From the Author.

Philosophical Transactions of the Royal Society of London for the year 1847. (Parts 1 and 2.) London, 1847. From the Royal Society.

Greenwich Astronomical Observations for 1845. London, 1847. From the Royal Society.

Prof. Loomis. Astronomical Observations at Hudson Observatory, Ohio. 3d Series. (Extr. from Trans. Amer. Phil. Soc., Vol. X.) From the Author.

Proceedings of the Academy of Natural Sciences. Philadelphia. Vol. III., 1846 - 47, and Vol. IV. to April, 1848. From the Academy.

Proceedings of the American Philosophical Society at Philadelphia. Vol. IV., for 1847. 8vo. From the Society.

Transactions of the Linnæan Society of London. Vol. XX., Part 2. 4to. -- Proceedings of the Linnæan Society, Nos. 30 – 33. (1846 47.) 8vo. — From the Society.

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