Chemistry and Physies. 381 
equal weight of iron was deposited on each rod; but, while the 
iron on the rod not exposed to the heliacal current was smooth and 
fair, the iron on the other rod was principally on its upper and 
lower portions in the form of tufts, having a crystalline sthaabaae, 
and resembling somewhat the appearance presented by a bar 
magnet after its introduction into iron filings. 
Jacobi found that both deposits were very feebly magnetic, and 
further experiments showed that iron oo by electolysis re- 
ceives a remarkably high charge of temporary magnetism, an 
has very feeble coercive force ; he Charohovs recommends such iron 
for the construction of electro- magnetic cores.— Ann. e oe . de 
Phys., Feb., 1873 
8. Ozone ‘and Antozone. Their History and Nature. “When, 
Where, Why, How is Ozone observed in the Atmosphere? by Cor- 
neivs B. Fox, M.D., Edin., Member of the Royal College of 
Physicians, Scstaton ete., ete. 330 pp., 8vo. 1873. Illustrated. 
London: J. & A. Churchill.— A very bei gels account of the 
numerous investigations into the nature of ozone and antozone, 
into their natural occurrence, and the methods of identifying them, 
as well as of the observations that have been made upon them 
and the conclusions based on these observations. It is a critical 
account also of these ceveral matters, not indeed, exhaustive, but 
tive, very sere, eh well arran ed, an nd as a gaide aid” an 
The first Prebinins to the needed. new ane eae is ox has 
as 
phot 
nents vA Natural Philosophy ; by Protea “Sir W. 
ee ana P.G. Tarr. Part I. 279 pp. 8vo. 187 i larendon 
nal treated of i in this solnme are Kinematics, te 
Laws and Princi yles, Experience, Measures and In struments, 
Btatios ¢ of a mde a and Statics of solids and fluids. 
