a” 
Miscellaneous Intelligence. 137 
14. Mollusca of Irkutsk.—M. Maack has recently sent to the Acad- 
emy of St. Petersburg, 27 species of mollusca, both land and fresh-water 
species, and it is remarkable that all the species without exception, are 
those of Europe, and pertain even to the mostcommon and most widely 
distributed species ; only four of them had not previously been observed 
in Siberia. —L’ Institut, Oct. 11, 1854 
IV. AsTrrRonomy. 
1. Elements Rh Urania (30), (Compt. Rend. Acad. Sci., tome xxxix, 
p. 644.)—Mr. Oudemans has computed the following elements of this 
planet from the Regent’s Pale observations of July 22, and those of 
Leyden of August 12 and Se 
Epoch wk ooo. aerwcnce) pe if 
Meananomaly,- - 208° 13) 37" -4 
Long. perihelion, - - - 26 42 59 re Aes Eqnx. 
asc. neds - - - 307 57 51-155) 1854-0. 
Tnclination . - Lon 41 3 
Angle of excentiiy, - - 8S 5439 2 
Mean daily motio : : - 979-715 
Semi axis major, - - - 2°35833 
2. Comet, 1854, 1V, (Astron, Journal, 77 and 78.)—Mr. Van Ars- 
dale has been anticipated in the discovery of this comet by Mr. Klin- 
kerfues, who saw it on the 11th of September. The oe parabolic 
elements of its orbit are published by Dr. B. A. Gou 
T. 1854, Oct. 27: ry Greenwich M. " 
Perihelion passage, - of 19 a") eat 7 
ong. asc. node,  =—- - + 824 35 33 -9§ 1854-0 
Inclination, : : « -,. 40° 39 23.4 
Log. q. - - 9-903504. 
3. New Planets. st itr new Saisie have been discovered in Paris : 
one Oct. 27, by Mr. Goldschmidt, which has been named Pomona (=), 
and the other Oct. 29, by Mr. Chacornac, named Potymnia i=) Thei 
positions at that time were: 
(32) R. A. . 24™ and Dec. a 55/ 
(33) sc h 94m 1 ee 6° 58’ 
V. MisceLtangous INTELLIGENCE. 
1. On the Means of Realizing the pagers me of the Air- Engine ; by 
*Wictiam Jon Macqvorn Ranxing, Civil Engineer, F.R.S.S., Lond. 
and Edin., fin The paper consists of four sections. In the first are 
that, as the efficiency in with the distance between those limits, 
and as it is easy to employ air with safety at temperatures far exceed 
ing that at which the p re of steam would cease to be safe and 
manageable, the ae ala theoretical efficiency of air-engines, con- 
sistent with safety, is much higher than that of steam-engines. For ex- 
ample, at the temperature of 650° Fahr., at which ope oe has 
Suconp Senms, Vol. XIX, No. 55.—Jan., 1855 
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