Produced by Bryan Ness, Josephine Paolucci and the Online Distributed Proofreading Team at https://www.pgdp.net. (This book was produced from scanned images of public domain material from the Google Print project.) Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man BY FRANCIS G. BENEDICT and THORNE M. CARPENTER [Illustration] WASHINGTON, D. C. PUBLISHED BY THE CARNEGIE INSTITUTION OF WASHINGTON 1910 CARNEGIE INSTITUTION OF WASHINGTON PUBLICATION NO. 123 The Lord Baltimore Press BALTIMORE, MD., U. S. A. PREFACE. The immediate development and construction of suitable apparatus for studying the complicated processes of metabolism in man was obviously the first task in equipping the Nutrition Laboratory. As several series of experiments have already been made with these respiration calorimeters, it is deemed advisable to publish the description of the apparatus as used at present. New features in the apparatus are, however, frequently introduced as opportunity to increase accuracy or facilitate manipulation is noted. We wish here to express our sense of obligation to the following associates: Mr. W. E. Collins, mechanician of the Nutrition Laboratory, constructed the structural steel framework and contributed many mechanical features to the apparatus as a whole; Mr. J. A. Riche, formerly associated with the researches in nutrition in the chemical laboratory of Wesleyan University, added his previous experience in constructing and installing the more delicate of the heating and cooling devices. Others who have aided in the painstaking construction, testing, and experimenting with the apparatus are Messrs. W. H. Leslie, L. E. Emmes, F. L. Dorn, C. F. Clark, F. A. Renshaw, H. A. Stevens, Jr., Miss H. Sherman, and Miss A. Johnson. The numerous drawings were made by Mr. E. H. Metcalf, of our staff. BOSTON, MASSACHUSETTS, _August 10, 1909._ CONTENTS. PAGE Introduction 1 Calorimeter laboratory 3 General plan of calorimeter laboratory 3 Heating and ventilating 7