Erratum in No. 227. 



^e 66, line 8 from bottom, the expression in brackets \ | should be raised to 

 the nth power. 



In the press, size of ' The New British Pharmacopoeia/ 



AN INTRODUCTION TO PHARMACEUTICAL CHEMISTRY. 



By John Attfield, Ph.D., F.C.S., 



Professor of Practical Chemistry to the Pharmaceutical Society of Great Britain, 

 many years Demonstrator of Chemistry at St. Bartholomew's Hospital. 



This work is essentially a handbook of Practical Chemistry. It is intended as a 

 Laboratory Guide for Medical and Pharmaceutical Students, and as an aid to the 

 study of Pharmaceutical Chemistry by the pupils of Medical Practitioners and 

 Chemists and Druggists. The aim of the author has been threefold ; to give con- 

 cise data for a complete course of Qualitative Analysis, to associate with these 

 data simple experiments in imitation of all the chemical processes of the British 

 Pharmacopoeia, and by means of introductory matter and short explanatory and 

 suggestive notes to direct the attention of the Student to the principles and facts 

 which the analytical and synthetical experiments are designed to illustrate. Prac- 

 tical Toxicology and the Chemical and Microscopical Characters of Morbid Urine, 

 Urinary deposits and Calculi, are included. All Chemical Formulae and Equa- 

 tions are in accordance with the modern theories of Chemistry. For the conve- 

 nience of Students preparing for Examination, Questions on Pharmaceutical Che- 

 mistry are given in an Appendix. 



John Van Voorst, 1 Paternoster Row. 



This day is published, 392 pp. 8vo, 15s., 



THE MECHANICAL THEORY OP HEAT, 



With its APPLICATIONS to the STEAM-ENGINE and to the PHYSICAL 

 PROPERTIES OF BODIES. 



By R. Clausius, 

 Professor of Physics in the University of Zurich. 



Edited by T. Archer Hirst, F.R.S., 

 Professor of Mathematics in University College, London. 



With an Introduction by Professor Tyndall. 



John Van Voorst, 1 Paternoster Row. 



Just published, in One Volume, crown 8vo, with Portrait of M. Chladni and 

 169 Woodcuts, price 9s., 



SOUND: 



A Course of Eight Lectures delivered at the Royal Institution of Great Britain. 

 By John Tyndall, LL.D., F.R.S. &c, 



Professor of Natural Philosophy in the Royal Institution and in the Royal 

 School of Mines. 



By the same Author, Second Edition, uniform, price 12s. 6d., 



HEAT CONSIDERED AS A MODE OF MOTION. 



London : Longmans, Green, and Co., Paternoster Row. 



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