Astronomy, 17 
briatum, Sph. Girgensohnii, Sph. teres, Sph. Pylaesii (in fruit), 
(in fruit), S 
) 
A. neglectum, Sph. laricinum, 
ph. Wulfianum, Sph. Lindbergii y Micromitrium Austini, Mier. 
Ephemorum papiliosum ; Ano- 
ectangium Peckii ; Conomitrium Hallianum ; Pottia riparia ; 
idymodon cylindricus; Didym. diversifolius ; Desmatodon 
Wood-euts. New York. 1872. (Ivison, Blakeman, Taylor & Co.) 
~—This little volume for young people has been made every way 
= u in its simple and interesting account of the 
abits of certain plants, by the author. The special subjects of 
the chapters are lants move, climb e positions ; 
? 
plant 
How plants employ insects to work for them; How certain 
Journal of Zoology.—A new Zoological Journal ( Journal de 
f. Paul Gervais of 
‘ompleted.in about 13 numbers, containing each 3 sheets of text, 
De ag A. Conra 
prntdes of North America”; by Isaac Lea, L.L.D. 46 pp., 8vo. 
: ; . Pp 
- Hiladelphia, 1872.—A new edition, originally from the Proceed- 
iM 
May, 
Ill Asrronomy. 
The Double Star Castor.—In the Astronomical Notices for 
Mr, Wilson advances the somewhat startling idea that the 
ceuPonents of the double star castor are describing an hyperbolic 
the 
bservations since 1740, when plotted, give an appar- 
eo 
nt orbit of eccentricity 2-2. The real orbit, he claims, has 
Sccentricity 3- 
necessi: 
an 
16. The recent observations show very decidedly 
ity of extending the periodic time of the orbit, even if 
