Miscellaneous Bibliography. 79 
4. An Elementary Treatise on Heat; by BaLYour Srewart, 
LL.D., F.R.S., Professor of Natural Philosophy at the Owens Col- 
lege, Manchester. Second edition. 12mo, pp. xx, 415. Oxford, 
1871. (Clarendon Press. New York: Macmillan & Co.)—We be- 
o the times, therefore; and in saying this, we have in mind the 
fact that its author is one of the foremost thinkers of the day in 
the department of the conservation of energy. e find conse- 
quently in the book a wealth of thought as entirely original as it 
is invaluable. The chapter on the Theory of Exchanges is incom- 
e 
why the magnetic poles are so distant from the 
eto 
Hon. de la Faculté des Sciences de Dijon. | p. 8vo.—Py 
Perrey continues his valuable labors in connection with the subject 
° 
mn 
