3 DECEMBER 1892, Page 12

Chemical Theory for Beginners. By Leonard Dobbin and James Walker.

(Macmillan and Co.—Nothing is more important than a good grounding in chemical theory, and Messrs. Dobbin and Walker have given us a neat and careful exposition of the prin- cipal working theories. There is so mush to be said about mole- cular weights, chemical equivalents, and electrolysis, that students should be thankful for whatever light they can get on the subject. This laDok is written for beginners, and beginners had better read it ; they are certain to learn something from it.