NUTRITION INVESTIGATIONS. 449 



ANALYSES OF FOOD MATERIALS AND DETERMINATION OF HEATS OF 



COMBUSTION. 



The metabolism experiments, dietary studies, and digestion experi- 

 ments have involved a considerable amount of analytical work and 

 the heats of combustion of a large number of samples of food have 

 also been determined. These determinations of heats of combustion 

 are made by the bomb calorimeter, and considerable attention has been 

 devoted to the perfection of the apparatus and methods by which it 

 is possible to determine the total or potential energy in a given mate- 

 rial with ease and accuracy. A good deal of attention has been paid 

 to the improvement of the bomb calorimeter and accessory apparatus 

 by Mr. O. S. Blakeslee, formerly mechanician at Wesleyan Univer- 

 sity, to whom much of the credit belongs. 



MISCELLANEOUS INQUIRIES. 



In addition to the lines of inquiry above stated a short study was 

 made of the composition of raw and cooked potatoes and the losses 

 during cooking. This study was made for the purpose of duplicating 

 some of the results obtained by Professor Snyder at the Minnesota 

 Experiment Station (see p. 455). 



^Considerable attention has also been given to analytical and experi- 

 mental methods involved in the various lines of investigation which 

 have been carried on in Connecticut, the detailed enumeration of which 

 is unnecessary. ' 



PUBLICATIONS. 



The results of above investigations are published in the following 

 bulletins of the Office of Experiment Stations: Bui. No. 44, Report of 

 Preliminary Investigations on the Metabolism of Nitrogen and Carbon 

 in the Human Organism, by W. O. Atwater, C. D. Woods, and F. G. 

 Benedict; Bui. No. 63, Description of a New Respiration Calorimeter 

 and Experiments on the Conservation of Energy in the Human Body, 

 by W. O. Atwater and E. B. Rosa; Bui. No. 69, Experiments on Metab- 

 olism of Matter and Energy in the Human Body, by W. O. Atwater 

 and F. G. Benedict, with the cooperation of A. W. Smith and A. P. 

 Biyant; Bui. No. 109, Further Experiments on the Metabolism of 

 Matter and Energy in the Human Body, by W. O. Atwater and F. G. 

 Benedict, with the cooperation of A. P. Bryant, A. W. Smith, and 

 J. F. Snell; Bui. No. 75, Dietary Studies of University Boat Crews, 

 by W. O. Atwater and A. P. Bryant; Bui. No. 98, The Effect of 

 Severe and Prolonged Muscular Work on Food Consumption, Diges- 

 tion, and Metabolism, by W. O. Atwater and H. C. Sherman, and Bui. 

 No. 43 (third article), Losses in Boiling Vegetables and the Composi- 

 H. Doc. 334 29 



