Page 2 - ALLEN'S COMMERCIAL ORGANIC ANALYSIS A TREATISE ON THE PROPERTIES, MODES OF ASSAYING... VOL VIII

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• PREFACE.
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In this volume, the last edition of which was issued fifteen years ago,
• very extensive alterations have been made, the greater part of the
volume being entirely new matter. The order of arrangement has,
however, been retained for the reasons stated in the earlier volumes. A
brief introductory article on enzymes has been added.
The methods of separation of amino-acids dealt with under Proteins
and certain matter included under Proteins of Digestion may perhaps be
regarded as, in some measure, duplicating material included in Vol-
ume VII; but the Editors have advisedly retained this matter in Volume
Vlll not only because it presents the information from another point
of view, but because its insertion was essential for the completeness of
these sections.
It is proposed to issue, at a later date, a supplementary volume which
shall contain not only a complete reference index of the whole work, but
shall bring the latter completely up to date by the incorporation of all
processes of analysis and information regarding analytical processes
which have appeared in the interval that has elapsed since the revision
of the work was first taken in hand.

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