rg  ber A Ee End 
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(257) 
at Philadelphia for promoting useful knowledge. Vol. X, 
new series. Part 11. Philadelphia 1852. 4°, 
De inhoud is als volgt: 
Art. 7. Investigations which led to the detection of the coïncidence 
between the computed place of the planet Levrerrier, and the 
observed place of a star recorded by Lalande, in May 1795. By 
C. WALKER. 
„ 8. Memoir on the reproduction of the Opossum. Didelphis Vir- 
giniana. Bij cu. p. meiGs, M. Dr. 
9. On some of the results of a series of Experiments relative to 
different parts of Gunnery. Bij Capt. roBT. FP. STOCKTON, of 
U. S. N. communicated by Prof. HENRY. 
„10, On the decomposing power of water at high Temperatures. By 
RICH, A. TILGHMAN, 
„11, On the neutral sulphate of the oxide of Ethyle, and the pro- 
ducts of its decomposition by water. By CH. M. WHITERILL, 
Dr. of Philosophy. 
„12. De calculo Eclipsium Besseliano Commentatio, Auma Dr. Gus- 
TAVO ADOLPHO JAHN. 
„18. On the longitude of Washington, computed from the mooncul- 
minations observed during the years 1839—1842 inclusive. By 
Lieut. J. M. GILLISS. 
„ 14, On the accuracy of the tabular longitude of the Moon, to be 
obtained by the construction of New. Lunar Tables. By miers 
FISHER LONGSTRETH. 
„15. On the organization of the Genus Gregarina of Dufour. By 
dos. LEIDY, M. Dr. 
„16. Some observations on Nematoidea imperfecta, and descriptions 
of three parasitie Infusoriae. By sos. Leip, M. Dr. 
„ 17. Meteorological Observations, Napa-Keang, (Loo-Choo,) 1848 to 
1849, made by Dr. BETTELHEIM. 
„18. Descriptions of new species of the Family Unionidae. By 
ISAAC LEA, 
„19. Description of a new Genus (Basistoma) of the Family Mela- 
niana, together with some new species of American Melaniaec. 
By ISAAC LEA, 
„20. Description of a New species of Helix, from California, and a 
new characteristic form of certain American Colimaceae. By 
ISAAC LEA. 
„21. On the fossil foot-marks in the red sandstone of Pottsville, 
Shuylkill County. Pennsylvania. By ISAAC LEA. 
Deze American Philosophical Society geeft ook proceedings 
uit, waarvan wij nu N°. 48, Vol. V, 8°. ontvingen, en 
ook de voorgaande bezitten. 
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