Transcriber’s notes: In this transcription, paired _underscores_ denote _italicised text_. A single underscore preceding curly brackets indicates that the bracketed character is subscripted (mostly in chemical formulae, e.g. CO_{2}). Footnotes have been positioned below the relevant paragraphs. Punctuation inconsistencies have been corrected silently, except for those occurring in footnote reference sources, which remain as in the original. Inconsistencies of hyphenation, use of italics, and spacing of abbreviations (such as i.e. and c.c.) have not been changed. In a large table following page 31, apparent inconsistencies of the authors of referenced sources are as in the original. Some of the figures in this table are indistinct. Passages of German text contain possible typographic errors that have been left as in the original. Spelling inconsistencies have not been altered, e.g. albumin/ albumen/albumine/albumid, but the following overt spelling errors were corrected: synonomous —> synonymous an Medndel —> and Mendel akaline —> alkaline Wochenscrift —> Wochenschrift by —> bei transferrence —> transference quantitity —> quantity recticulin —> reticulin sythetical —> synthetical Elaatin —> Elastin hiaton —> histon [Illustration: Cover] CARTWRIGHT LECTURES 1894 ON DIGESTIVE PROTEOLYSIS BEING THE CARTWRIGHT LECTURES FOR 1894 DELIVERED BEFORE THE ALUMNI ASSOCIATION OF THE COLLEGE OF PHYSICIANS AND SURGEONS OF NEW YORK. BY R. H. CHITTENDEN, Ph.D. _Professor of Physiological Chemistry in Yale University_ NEW HAVEN, CONN.: TUTTLE, MOREHOUSE & TAYLOR, PUBLISHERS. 1895 THE TUTTLE, MOREHOUSE & TAYLOR PRESS, NEW HAVEN, CONN. PREFACE The present volume, as explained by the title, consists mainly of a reprint of the Cartwright Lectures for 1894. These lectures were originally printed in the current numbers of the Medical Record, but so many requests have been made for their publication in a more convenient and accessible form that they are now re-issued, through the courtesy of the publishers of the Record, in book-form. It is hoped that these lectures may prove of value not only in calling attention to some of the fundamental chemico-physiological facts of digestion, but in stimulating closer investigation of the many questions which are so intimately associated with a proper understanding of the processes concerned in the digestion and utilization of the proteid food-stuffs. R. H. CHITTENDEN. CONTENTS. LECTURE I. _The general nature of Proteolytic Enzymes and of Proteids._