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ORGANIC ANALYSIS

A TREATISE ON

THE PROPERTIES, PROXIMATE ANALYTICAL EXAMINATION,
AND MODES OF ASSAYING THE VARIOUS ORGANIC
CHEMICALS AND PRODUCTS EMPLOYED IN

THE ARTS, MANUFACTURES, MEDICINE

WITH CONCISE METHODS FOR

THE DETECTION AND DETERMINATION OF THEIR IMPURITIES,
ADULTERATIONS, AND PRODUCTS OF DECOMPOSITION

BY

ALFRED H. ALLEN, F.I.C., F. C.S.

PAST PRESIDENT OF THE SOCIETY OF PUBLIC ANALYSTS

PUBLIC ANALYST FOR THE WEST Riding of yoÖRKSHIRE, THE CITY Of sheffield, etc.

Second Edition, Revised and Enlarged

VOLUME IV

PROTEIDS AND ALBUMINOUS PRINCIPLES
PROTEOÏDS OR ALBUMINOÏDS

PHILADELPHIA

P. BLAKISTON'S SON & CO.

1012 WALNUT STREET

1898

HARVARD COLLEGE LIBRARY

FROM THE LIBRARY OF WILLIAN FOR SOU LAMAR SEPT. 24, . A

COPYRIGHT, 1898, BY

P. BLAKISTON'S SON & CO.

PRESS OF

Sherman & Co., Philadelphia.

PREFACE TO VOLUME IV.

"COMMERCIAL

THE production of the Second Edition of my ORGANIC ANALYSIS has extended over fourteen years. With VOLUME IV., now issued, the work comes to an end. The earlier Volumes have long been out of print, but I felt it undesirable to attempt their revision until the work was finished, and the time required to effect this has greatly exceeded my expectations. I much regret that it is now impossible for me to undertake the enormous labor which would be necessary for the thorough revision of the earlier Volumes, and hence I am reluctantly compelled to leave the work, to which I have devoted the best years of my life, to a certain extent incomplete. I hope, however, to publish an Appendix to each Volume, which will contain the more important of the facts and processes which have accumulated in such enormous numbers of late years.

The hiatus occasioned by my inability to undertake personally the systematic revision of the earlier Volumes is fortunately minimized by the fact that my friend Dr. Henry Leffmann, of Philadelphia, is now engaged in partially revising them. Volume I., as edited by him, will be published by the time these lines are read, and Volume II. will follow very shortly.

I may here repeat that I am fully conscious that much of the matter of VOLUME IV. is scarcely such as might be expected to be contained in a work purporting to treat of Commercial Analysis, but I have thought it better to include all facts possessing for me (vii)

an analytical or practical interest, believing that what I find useful myself will also be of value or interest to others.

I am indebted to Dr. James Edmunds, Mr. Otto Hehner, Mr. F. W. Richardson, Mr. H. Droop Richmond, Dr. S. Rideal, Dr. H. Clifton Sorby, Mr. E. C. C. Stanford, Dr. W. J. Sykes, and other friends, for perusal and correction of certain of the articles, and express my sincere thanks for the services they have rendered me in this connection. I have also to thank Dr. T. E. Thorpe for his courtesy in communicating the details of the method of analyzing altered milk now employed in the Government Laboratory.

I desire likewise to acknowledge the zealous assistance rendered by Mr. Alfred B. Searle and Mr. Arnold R. Tankard in the investigation in my laboratory of many of the tests and processes described, and to express my obligation to the latter for his collaboration generally in the production of the Volume.

ALFRED H. ALLEN.

SHEFFIELD, 27th August, 1898.

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