DepartmilNt of Dairy Industry. 79 



courses in Butter-making and Cheese-making. We have added to our 

 general equipment in these hnes, during the past year. 



One 200 gallon Jensen Cream Ripener. 



One 300 gallon Simplex Cream Ripener. 



One 100 gallon Starter Can. 



One large Steam Sterilizer for market milk work. 



The steam sterilizer was built entirely by our men, so the cost to the 

 department was simply for the material. It is a steam-tight room 8 by ii 

 feet, built of hollow tile plastered on both sides with portland cement. 



The above additional equipment will make it possible for us to give 

 better instruction in the lines of work concerned. 



4. Changes in staff. — The only change in the department stafif during 

 the past year was the appointment of Miss Lois W. Wing as assistant in 

 the Bacteriology Laboratory. This was made necessary by the resigna- 

 tion of ^liss Minnie Jenkins who left at the close of last year. 



INVESTIGATION. 



The teaching work of the department has kept our men so busy that 

 it has been difficult to get time for research work. Experimental work, 

 however, has been done in the following lines : 



1. A study of tests for moisture in butter. — This work is a continua- 

 tion of that begun last year. The results have been published in Bulletin 

 No. 281. 



2. A study of the factors affecting the efficiency of cream separators. — 

 This work was undertaken a year ago and is still going on. It is expected 

 that during the coming year the work can be completed and the results 

 published in bulletin form. 



3. Market milk inspection. — The inspection work in connection with 

 the Ithaca milk-supply has been continued with the result that the depart- 

 ment is getting valuable information for use in instruction work, and 

 there is appearing a marked improvement in the quality of the milk- 

 supply of the city. This work is being conducted in cooperation with 

 the Ithaca Board of Health and the milk producers. When the inspection 

 work was begun the average germ content of all of the samples taken 

 during the year 1907-8 was 707,800. The average for all samples taken 

 in the year 1909-10 was 221,000, or considerably less than one third the 

 average for the first year's inspection work. The data accumulated from 

 this work will in time furnish material for a useful bulletin. 



4. Cow-testing ivork. — The second year of the cow-testing work con- 

 ducted by this department closed April 30. 1910. Two hundred and nine 



