308 THE ANALYST. R E V I E W . A TREATISE ON PRACTICAI, CHEMISTRY AND QUALITATIVE ANALYSIS. By FRANK CLOWES, D.Sc., Emeritus Professor in the University College, Nottingham ; Chemical Adviser to the London County Council, etc. Seventh edition. London : Churchill, 1899. This work, which has now reached its seventh edition, is so well known to students and teachers of chemistry, that any special review of it is almost unneces- sary, and criticism is disarmed. I t has, in fact, become a standard work, and may be regarded as one of the leading English text-books of Qualitative Analysis, It has perhaps ever been a vexed question whether detailed directions to the student are on the whole better than a brief outline of the tests to be made by him, but the unqualified success of Dr. Clowes’s work may be taken as a strong argument in favour of the former view ; and always provided that the student; can be induced to read, there can be no doubt that a conscientibus study of this manual will insure a sound knowledge of the subject, while the time of the teacher will be largely saved. The tables of differences constitute a very special feature, and in this and the later editions there is scarcely any branch of the subject which has not been more or less fully handled, notably many organic substances of importance, and the reactions of the rare metals. There is perhaps only one regrettable omission-that of the theoretical explana- tions of analytical processes; these I venture to think might still find a place in a new edition. Dr. Clowes is not unconscious of this omission, and alludes to it in his preface, H. W. H.