Via Scientific Proceedings 
flour bread, (4) white flour bread, (5) entire wheat bread, and (6) - 
mixed diet. 
The exclusive bread diets did not support life, although no 
pathological lesions were found to be characteristic of any of the 
diets. 25 per cent cottonseed flour dough supported life longer 
than 25 per cent cottonseed flour bread. The animals fed en- 
tire wheat bread and white bread lived no longer than the ani- 
mals fed the cottonseed flour breads. f 
Less nitrogen was required to maintain rats and mice at con- 
stant weight when white bread was fed than when entire wheat. 
bread was fed. The largest amount of nitrogen required to main- 
tain constant weight was in the case of the animals fed 40 per cent. . 
cottonseed flour bread. These findings are in line with the re- 
sults reported in the literature for larger animals. 
After 6 months, when the experiment closed, the bodies of 
twenty-four rats, four from each of the six groups, were separately 
analyzed for inorganic constituents. | 
The 40 per cent cottonseed flour bread was highest in total 
ash, P.O;, CaO, and MgO of any of the breads fed. The ash 
constituents were apparently not properly balanced as the bodies 
of the rats fed on this bread were low in total ash and especially 
in P,O;-free ash. ‘The ratio of MgO to CaO was 1:15 for the 
bodies of the rats fed on 40 per cent cottonseed flour bread and 
1: 25 for the controls. 
The exclusive feeding of cottonseed flour bread apparently 
caused changes in the ash constituents of the tissues of the rats 
analyzed. These changes appeared in the results for the rats 
fed 25 per cent cottonseed- flour bread and dough and were 
marked in the cases of the rats fed 40 per cent cottonseed flour bread. 
BORON. ITS EFFECT ON CROPS AND ITS DISTRIBUTION IN 
PLANTS AND SOILS IN VARIOUS PARTS OF THE 
UNITED STATES. 
By F. C. COOK anp J. B. WILSON. 
(From the Bureau of Chemistry, United States Department of Agriculture, 
Washington.) 
Borax and colemanite (calcium borate) were found to be effec- 
tive larvicides for the house-fly.2. To determine the effect of the 
? Cook, F. C., Hutchison, R. H., and Scales, F. M., U. S. Dept. Agric., 
Bull. 118, 1914. 
