PROGRESS REPORT OF INVESTIGATIONS IN HUMAN 

 NUTRITION IN THE UNITED STATES, 1905-1909. 



By C. F. Langworthy, In Charge of Nutrition Investigations 

 INTRODUCTION. 



For many years progress in the study of various phases of nutrition 

 has been continuous in the United States. The articles which are 

 inchided in this summary of work reported during the years 1905- 

 1909, inckisive, have appeared in the reports and bulletins of 

 the United States Government and of the agricultural experiment 

 stations, scientific journals, reports of institutions, and similar 

 publications. 



It is recognized that the list of investigations cited is by no means 

 complete, but it is believed that enough has been brought together 

 to show that the work has grown and that important contributions 

 have been made, not only to the fund of available data of interest 

 to students of nutrition and to practical workers, but also to the 

 subject or methods of investigation and to the more important ques- 

 tion of the fundamental theories of nutrition. A similar summary 

 has appeared in an earlier publication « of this Office, and it is believed 

 that such surveys are timely and useful as a means of showang the 

 progress which is being made in America in the study of food and 

 nutrition. 



It is characteristic of the situation that as heretofore a large number 

 of the investigations which have been reported were carried out 

 under governmental or institutional auspices, and it may make the 

 summary of the investigations themselves simpler if a brief statement 

 concerning the relation of the more important of these agencies to 

 nutrition work is given. 



CONTRIBUTORS TO THE SUBJECT OF NUTRITION. 



The War and the Navy departments, the Department of Commerce 

 and Labor, and the Department of Agriculture are the branches of 

 the Federal Government in which naturally most attention is directed 

 to topics which are related to the problems of nutrition. In the 

 offices of the Commissary-General of the War Department, the 



»U. S. Dept. Agr., Office Expt. Staa. Rpt. 1905, p. 225. 



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