NUTRITION INVESTIGATIONS. 461 



the institution named. Six dietary studies — one of a professional 

 man's family, four of mechanics' families, and one of a laborer's fam- 

 ily — were reported, as well as a study of the composition and cost of 

 bakers' bread in Pittsburg and the composition of bread in relation to 

 the changes which the materials undergo in baking. In conducting 

 this investigation, Miss Bevier was aided by the directors of Kingsley 

 House, a college settlement of Pittsburg. Miss L. P. Meloy and 

 Miss E. R. Evans rendered much assistance in the practical details of 

 the work. The investigations were published as Bulletin No. 52, 

 Nutrition Investigations in Pittsburg, Pa., 1894-1896. 



TENNESSEE. 



Investigations in this State have been carried on in cooperation with 

 the University of Tennessee by Prof. Charles E. Wait. Professor Wait 

 has had the assistance of Messrs. C. O. Hill, J. O. La Bach, C. A. Mooers, 

 W. H. Gildersleeve, and W. K. Hunter. Valuable assistance at the 

 beginning of the work was rendered by Mr. H. M. Smith, then of 

 Middletown, Conn. The work was begun in 1898, and is being con- 

 tinued at the present time. 



DIETARY STUDIES. 



Eleven dietary studies were carried on in connection with these 

 investigations — three of college students' clubs and two in mechanics' 

 families and six among families of mountaineers. The results of these 

 latter studies have not yet been published. The results of the dietary 

 studies are of much interest in themselves and are especially valuable 

 when taken in connection with those of similar studies made in other 

 parts of the United States. 



DIGESTION EXPERIMENTS. 



A large number of digestion experiments have been made by Profes- 

 sor Wait, 21 of these having to do simply with the digestibility either of 

 single food materials or of food of more or less mixed diet. A large 

 number of digestion experiments have been made in connection with 

 studies of the effect of muscular work upon the digestibility of food 

 and the metabolism of nitrogen. 



In an average of 47 digestion experiments carried on for the purpose 

 of studying the effect of muscular work upon digestion and nitrogen 

 metabolism practically no difference was found in the proportions of 

 nutrients and energy digested when the subjects were at rest and at 

 work. Neither was there found any noticeable effect of the work in 

 increasing nitrogen metabolism. A large number of similar experi- 

 ments still await publication. The results of these bear out the results 

 already published and indicate that a moderate amount of muscular 

 work does not noticeably affect the digestion, nor does it cause increased 

 metabolism of nitrogen when there is sufficient energy in the diet. 



