A MANUAL FOR THE USE OF ANALYTICAL CHEMISTS AND EXPERTS. _WITH AN INTRODUCTORY ESSAY ON THE GROWTH OF MODERN TOXICOLOGY._ BY ALEXANDER WYNTER BLYTH, M.R.C.S., F.I.C., F.C.S., &c., BARRISTER-AT-LAW; PUBLIC ANALYST FOR THE COUNTY OF DEVON; AND MEDICAL OFFICER OF HEALTH AND PUBLIC ANALYST FOR ST. MARYLEBONE. THIRD EDITION, REVISED AND ENLARGED. With Tables and Illustrations. LONDON: CHARLES GRIFFIN AND COMPANY, LIMITED, EXETER STREET, STRAND. 1895. (_All Rights Reserved._) D. VAN NOSTRAND COMPANY, NEW YORK. PREFACE TO THE THIRD EDITION. The present edition, which appears on the same general plan as before, will yet be found to have been in great part re-written, enlarged, and corrected. Analytical methods which experience has shown to be faulty have been omitted, and replaced by newer and more accurate processes. The intimate connection which recent research has shown to exist between the arrangement of the constituent parts of an organic molecule and physiological action, has been considered at some length in a separate chapter. The cadaveric alkaloids or ptomaines, bodies playing so great a part in food-poisoning and in the manifestations of disease, are in this edition treated of as fully as the limits of the book will allow. The author, therefore, trusts that these various improvements, modifications, and corrections will enable “POISONS” to maintain the position which it has for so many years held in the esteem of toxicologists and of the medical profession generally. THE COURT HOUSE, ST. MARYLEBONE, W. _June, 1895_. CONTENTS. PART I.--INTRODUCTORY. I. THE OLD POISON-LORE. Section Page