20 Report of the President. 



VIII. Department of Entomology. 



(a) New courses in General Biology, Animal Parasites, and the Rela- 

 tion of Insects to Disease were offered this year. The department gave 

 instruction to 401 students. 



(b) Members of the department staff are preparing and publishing 

 several text books. A text book on general biology has been published, 

 and the demand for it has already made a second edition necessary. 

 Other works in course of preparation are : A manual of the Arachnida 

 of North America, a handbook of fruit insects, tables for the identifica- 

 tion of the insects of the northeastern United States, and a text book 

 on Insect Morphology. Studies have been made of the Snow-white 

 Linden Moth, the Mallophaga infesting domestic fowls, the Cabbage 

 Aphis, the Larch Case-bearer, Joint-worms infesting grains and grasses, 

 the Red Bug of the apple, the Plum-leaf Miner, etc., and will form the 

 basis for future publications of results. At the biological field station 

 in the Cayuga Lake marshes investigations are being conducted in the 

 biology of aquatic organisms, the food of fishes, etc. 



(c) Exhibits of insect pests at fairs and lectures before agricultural 

 societies on entomological subjects have comprised the extension activities 

 of the department. 



IX. Department of Dairy Industry. 



(a) In the thirteen regular courses offered by the department there 

 were enrolled 298 students. The department also gave instruction to 

 12 graduate students, and to 151 winter-course students. 



(b) The study of tests for moisture in butter was continued and the 

 results published in Bulletin No. 281. Inspection of the milk supply of 

 the city of Ithaca has been continued ; two years of this work has resulted 

 in reducing the average germ content of Ithaca's milk by two-thirds, 

 besides affording valuable information for purposes of instruction and 

 for later publication in bulletin form. Other investigations of the depart- 

 ment have included a study of the factors affecting the efficiency of 

 rream separators, experiments in different methods of making the Bab- 

 cock test, and experimental work in the manufacture of Camembert 

 cheese. 



(c) Members of the staff have given addresses during the year at 26 

 gatherings of farmers, have accompanied department exhibits on farm 

 trains and at eight county fairs as well as the State fair, and have 

 answered a large number of inquiries from dairymen of this and other 

 States. 



