BUREAU OF CHEMISTEY. 603 



pollution on the condition of shollfisli grown in these waters; and of 

 irrigation and drainage waters and methods of analysis especially 

 applicable to them. 



In addition to the examination of insecticides and fungicides and 

 the carrying out of analyses in connection with chemical problems 

 relating thereto, as called for by other bureaus of the department, the 

 following work and investigations will be prosecuted: (1) Analyses 

 of insecticides and fungicides for the Insecticide and Fungicide Board 

 in connection with the enforcement of the insecticide act of 1910; 

 (2) orchard and laboratory tests of poisonous compounds at present 

 used as insecticides, with the view of finding some substance which 

 may be so used on peach and other tender foliage; (3) the supposed 

 injury to fruit trees from the accumulation of toxic salts in the soil, 

 due to the use of insecticides, in cooperation with the Bureau of Ento- 

 mology; (4) the arsenic and copper content of fruit, vegetables, etc., 

 to which materials containing these substances have been applied in 

 spraying operations; (5) improved and new methods for examining 

 insecticides and fungicides. 



The examination of cattle and poultry foods entering into interstate 

 commerce will be considered, and extensive study will be made of 

 range forage crops, necessitating a careful comparison of all pub- 

 lished work done along that line. There will be. as in the past, much 

 work done for other departments and bureaus of the Government, as 

 well as for other laboratories of the Bureau of Chemistry, to aid in 

 solving various chemical problems involving grains and cattle foods. 

 Chemical methods of determining the deterioration duo to molds, 

 bacteria, etc., in cattle foods and improved methods of cattle-food 

 analysis will be continued, and investigations of cattle-food manu- 

 facturing plants will be made with the idea of determining more 

 definitely just what substances should be present in certain cattle- 

 food materials which enter interstate commerce. 



The study of the effect of smelter wastes on animal and vegetable 

 life will be continued as such work is requested by the Department 

 of Justice. If time permits, the effect of other waste on vegetation 

 and animal life will be undertaken and. sanitary studies relative to 

 poisonous substances in household articles and foods and feeds will 

 be continued. 



SUGAR IN^^ESTIGA'^0NS. 



A continuation of the study of maple sap and its changes when 

 stored in containers of various metals and when concentrated in 

 evaporators made of different metals will be carried out during the 

 maple season. The work on sugar-cane products and sorghum sirup 

 and the study of the sugar industry of the South will be pushed 

 duriug the manufacturing season. The environment studies on the 

 sugar content of muskmelons will be steadily advanced. 



PLANT PHYSIOLOGICAL STUDIES. 



The work for the coming year will continue to be along the linos 

 of collaboration with the different offices of the Bureau of Plant 

 Industry, including (1) investigations on the influence of environ- 

 ment on the composition of cereals and other plants, and (2) a study 

 of the value of wheat for milling and baking purposes. Now in- 

 vestigations will be undertaken as follows: (1) Methods of bread 



