378 
POPULAR SCIENCE REVIEW. 
Elements of Natural Philosophy. 2nd Edition. By Jabez ITogg. Bohn’s 
Scientific Library. 
0 those who are not initiated into the mysteries of physical science. 
and therefore require a hook written in the simplest possible style, 
this volume will prove acceptable. It contains a very large number of 
important physical facts, stated in the most simple and popular language, 
and illustrated by a considerable number of woodcuts. 
The information given in it is of a very reliable character, and in 
nearly all cases it is up to the present state of knowledge in the par- 
ticular point under consideration ; but in one instance, at page 380, the 
old method of obtaining oxygen, by heating black oxide of manganese 
red hot, is still given, although the much more convenient and easy 
method of obtaining it, from a mixture of chlorate of potash and man- 
ganese merely by the heat of a spirit-lamp, has long superseded it. Some 
qualification is also desirable to be made to the statement at page 9, that 
“ no direct pressure will break glass, if it be supported from behind.” The 
volume is particularly suitable for those who desire popular instruction in 
physics. 
