1914.] PUBLIC DOCUMENT — No. 31. 43 a 



(c) The work on insecticides has been comparatively light, 

 and that largely advisory, with the exception of a carefnl ex- 

 amination of several samples of a new dry acid lead arsenate 

 which the entomological department has tried the past season. 



(d) Considerable time has been spent during the past year in 

 the development of an adiabatic bomb calorimeter, in co-opera- 

 tion with Mr. E. A. Thompson, the able mechanic of Amherst. 

 The apparatus is now completed and is proving quite satis- 

 factory. 



Mr. Morse and assistant have given their time to work on 

 asparagus, cranberries, and to the action of sulfate of ammonia 

 on the soil of field A of the station. 



(a) The work of the past year on asparagus has been the 

 completion of determinations of the composition of asparagus 

 shoots and tops at successive stages of growth. 



(&) The study of the composition of the drainage water of 

 miniature cranberry bogs constructed on the station grounds 

 has been continued on the same lines as last year, with still 

 more attention to details of individual bogs. 



(c) Effect of sulfate of ammonia on the soil. Particular at- 

 tention has been giv^n to composition of the drainage waters 

 in field A and also to the ability of the soil in different plats 

 of the field to absorb ammonia from the ammonium sulfate. 

 One notes a large removal of calcium from the soils of the 

 plats receiving ammonium sulfate. The so-called acidity of 

 soils thus fertilized is probably due, in part at least, to the sol- 

 vent action of the ammonium sulfate on the calcium. 



Work in animal nutrition by Dr. Lindsey has included : — 



(a) Digestion experiments with hay, corn meal, mangels, 

 cabbage, cabbage leaves, Swedish turnips, Postum cereal resi- 

 due, Mellin's Food Avaste, two kinds of fish meal and ]\[olas- 

 sine meal, 



(&) A study of fish meal as a source of protein for dairy 

 animals. A combination of bran, corn meal and cottonseed meal 

 was compared with bran, corn meal and fish meal. The results 

 indicated that it was perfectly feasible to use fish meal as a 

 part of the ration for dairy animals ; but at prices usually pre- 

 vailing, it might make the ration a little more expensive. 



