DR. MIALL states that he has published this pamphlet in the hope that it “might interest, and even instruct, some junior students of chemistry.” To treat of the structure of the atom, radioactive changes, isotopes, and the octet theory in twenty-six pages, and in such a way as to be clear and interesting as well as accurate and instructive, is a task which calls for no little skill. Dr. Miall has undertaken it with a great measure of success, and his small pamphlet should fulfil the object he had in mind in its publication. If he had given some account of Sir J. J. Thomson's recent theory the whole range of the subject would have been covered: perhaps he will do this in future issues.
The Structure of the Atom: Notes on some Recent Theories.
By Dr. Stephen Miall. Pp. iii+26. (London: Benn Bros., Ltd., 1922.) 1s. 6d. net.