DEVELOPMENT OF NUTRITION INVESTIGATIONS. 457 



TECHNICAL REPORTS, POPULAR BULLETINS, AND OTHER NUTRI- 

 TION PUBLICATIONS. 



The nutrition publications of different sorts which are issued by the 

 department as occasion offers are the principal means by which the 

 information secured through the nutrition investigations and the 

 systematic compilation of data carried on as a part of the work 

 are made available to the public. They have included technical 

 bulletins, series of colored charts, summaries for annual reports of 

 the department and the Office of Experiment Stations, Farmers' 

 Bulletins, separates or reprints, circulars, summaries made for the 

 Experiment Station Record of technical articles on nutrition which 

 have appeared in the United States and other countries, and popular 

 summaries of nutrition investigations carried on at the agricultural 

 experiment stations for the series of Farmers' Bulletins entitled 

 " Experiment Station Work." 



It is the policy of the department to distribute all its publications 

 free as long as the supply lasts, and after that to refer applicants to 

 the Superintendent of Documents, Government Printing Office, who 

 is authorized by law to sell all Government publications at a nominal 

 price. The Experiment Station Record, a periodical which is pub- 

 lished in two annual volumes of eight numbers each, is distributed to 

 a very carefully selected list, and a considerable list of paid subscrib- 

 ers is maintained by the Superintendent of Documents, Government 

 Printing Office. 



Outside the United States there is no general distribution of bulle- 

 tins free of charge, and both technical and popular bulletins and the 

 Experiment Station Record are sold by the official above mentioned 

 for sums designed merely to cover cost of publication and postage. 



The 60 or more technical bulletins issued since the nutrition in- 

 vestigations were organized report data on such subjects as the com- 

 position of food materials, studies of experimental methods, results 

 of digestion experiments, special studies of the metabolism of nitro- 

 gen and other elements, experiments with the respiration calorimeter, 

 studies of the changes and losses brought about in different food 

 materials bv cooking processes, and similar topics. 



Two series of colored charts have been issued, each of which was 

 designed to show in graphic form the composition of common food 

 materials and to give some generalizations regarding the functions 

 of food and the theories of nutrition. Like technical bulletins, these 

 colored charts are published in limited editions, but can be pur- 

 chased of the Superintendent of Documents. 



Summaries of nutrition investigations are published both in the 

 annual report of the Secretary of Agriculture, particularly with 



