1923.] PUBLIC DOCUMENT — No. 31. 19a 



with nicotine sulfate did not give as satisfactory results, chiefly because of their inferior 

 physical qualities. Comparative tests of superfinely ground tobacco dusts have been 

 planned for another season. 



Entomology Project 16. "Investigation of materials which promise value in 

 insect control." 



Assistant Professor Bourne. 



This is a continuing project covering materials as they may appear. This season two 

 materials were tried out — Derris and Flyosan. The tests with Derris in its various 

 forms were quite satisfactory as far as they went, and further tests of this material will 

 be made the coming year. When these tests have been completed a final report on 

 Derris can be made. Flyosan in some of the tests also gave good results, but more 

 studies of it are necessary before full statements would be advisable. 



Pomology Project 11. "To test new spray materials as they become com- 

 mercially important." 



Professor Sears and Assistant Professor Gould. 



The following materials were tried out this year in comparison with standard liquid 

 lime-sulfur and arsenate of lead: Bordeaux mixture 3-10-50, Nurexo Bordeaux Lead, 

 Nurexo Spraydried, Celesto, Sulfurex, Sulfocide, Sulco V-B, Dry Lime Sulfur, Nurexo- 

 form Lead, Calcium Arsenate and Cal Arsenate. 



While some of these materials gave good results, none of them gave promise of suf- 

 ficient merit to replace liquid lime-sulfur and lead arsenate. 



Animal Nutrition. 



The use of purchased concentrates, mixed or unmixed, is the salient charac- 

 teristic of Massachusetts animal industry. The cost to the industry, and finally, 

 of course, to the consumer of its products, is immense; possible waste, in case 

 the materials are unwisely used, or bought on the basis of ignorance instead of 

 knowledge, enormous. The work of the Station in this direction has, therefore, 

 two objectives: first, to develop a basis for the productive feeding of these articles; 

 and secondly, to measure the characteristics of various feedstuffs, so that dairy- 

 men may have a sound basis of purchase. 



Digestibility of Feeding Stuffs. 



Chemistry Project 2. "Digestion experiments." 



Professor Lindsey and Assistant Professor Archibald. 



In addition to digestion experiments made in connection with projects 12 and 19, one 

 experiment was made with cocoa dust, with results incorporated in manuscript already 

 prepared on "Digestibility of Cattle Feeds." 



Chemistry Project 9. "Determining the digestibility and metabolizable energy 

 in feeds for horses." 



Professor Lindsey and Assistant Professor Archibald. 



Final report is now being prepared for publication. 



Chemistry Project 12. "Attempting to improve the nutritive value of grain 

 hulls." 



Assistant Professor Archibald and Professor Lindsey. 



Considerable progress has been made on this project. In addition to the treatment 

 and determinations of digestibility of oat and rice hulls already reported, the following 

 materials have been treated and the influence of treatment on digestibility determined : 

 — namely, barley hulls, cottonseed hulls, and flax shives. In addition to the regular 

 anah'sis, determinations of starch, galactan, pentosans, and lignin have been made on 

 the natural and treated materials, and determinations of the above substances are now 

 being made in the feces. 



