38a EXPERIMENT STATION. [Jan. 



The Holstein tests, usually based on a seven or thirty day 

 period, require the presence of a supervisor during the entire 

 test. During the year 25 different men have been employed 

 in these short tests, and 160 seven-day, 25 fourteen-day and 

 42 thirty-day tests, making a total of 227, have been com- 

 pleted. This work was conducted at 23 different farms. 



4. NuMEKicAL Summary of Laboratory Work, December, 

 1917, to December, 1918. 



There have been received and tested 50 samples of water, 

 543 of milk, 430 of cream, 1 of condensed milk, 3 of butter, 

 226 of feedstuff's, 149 of fertilizer, 122 of soil, 3 of lime prod- 

 ucts, 2 of organic substances for arsenic, 26 of vinegar, 1 of 

 coal, 2 of arsenate of lead, 73 moisture tests on corn for corn 

 contests, and 4 miscellaneous. 



The fertilizer control work involved the collection of 981 

 samples, and the feed control, 1,200 samples. There have 

 also been examined, in connection with experiments made by 

 the diff'erent departments of the station, 163 samples of milk; 

 145 of cattle feed; 44 of feces and 35 of urine; mineral analyses 

 on 5 samples each of corn grain, stover and cob, on 18 samples 

 of cabbages, and on 10 samples of strawberries; weights and 

 dry matter determinations on 264 samples each of millet 

 straw and seed; weights, dry matter and nitrogen determina- 

 tions on 57 samples each of millet seed and straw; weights, 

 dry matter and nitrogen determinations and partial mineral 

 analyses on 144 samples each of millet seed and straw. The 

 above totals 5,175 samples, and does not include the work of 

 the research section, cow testing or the dairy law. 



