New York Agricultural Experiment Station. 



79 



Table XV — (continued). 



Grand average: Whole milk, 9S1 ; strippings, 251; difference, 72 



If consideration is given to the returns from the s'amples of whole 

 milk the results are favorable to machine cleaning in the case of 

 Gertie F. 1 and to hand cleaning in the case of the three other 

 cows. If the germs in the strippings are deducted the results are 

 favorable to hand cleaning in the case of Gertie F. 2 and to hand 

 cleaning in the other three cases. The grand averages of the 62 

 samples of whole milk are 955 after hand and 981 after machine 

 cleaning but if the strippings are deducted these averages stand at 

 512 and 727 indicating an increase due to machine cleaning of 30 

 per ct. 



In the three preceding comparisons the cows were carefully clipped 

 at the beginning of each comparison as it was desired to conduct 

 this test of the vacuum cleaner under the general conditions under 

 which it was being used in dairies. A fourth comparison was made 

 between February 29 and March 28, 1912, using four cows which 

 had not been clipped but the other conditions were the same as 

 those of the preceding comparison. The results obtained from the 



