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ANAI,YSES OF FODDERS AND FEEDING STUFFS. 209 
ANALYSES OF FODDERS AND FEEDING STUFES. 
Byers. BENEDICT) 

During the past year analyses have been made of over 200 
food materials used in connection with metabolism and diges- 
tion experiments with men, and of about 120 samples of crops 
grown in field experiments with fertilizers. ‘The methods of 
analysis were those recommended by the Association of Official 
Agricultural Chemists, with such minor modifications as have 
been found desirable.* 
The descriptions and results of analyses of food materials 
used in the experiments with man will be published with other 
details of the investigations. The descriptions and results of 
the analyses of the samples of field crops are given on pages 
211-218 of the present Report. The data of Table 52 show 
only the percentages of water, dry matter, nitrogen, and protein 
(N. X 6.25) in the fresh substance, and of nitrogen and protein 
(N. X 6.25) in the water-free material, as these suffice to indi- 
cate the proportions of nitrogen in the crop and also the effect 
of the nitrogenous fertilizers upon the proportions of protein 
in the plants. In previous Reports the complete analyses of 
both fresh and dry substances have been given, but the work 
of the Station has increased to such extent as to make it neces- 
sary to reduce the details to the minimum consistent with the 
purpose of the inquiry. It would have been interesting to 
determine the proportions of proteid and non-proteid nitrogen 
had the resources of the Station and the accuracy of the 
methods now in use been such as to warrant it. Tests for the 
presence of nitric acid were made ina considerable number of 
samples, especially those from the plots in which the largest 
quantities of nitrogen were applied jin the sterilizers ale 
few cases there were indications of minute quantities of nitric 
acid in the samples tested, but in most not even traces were 
detected. 

* See Report of this Station for 1891. 
