New York Agricultural Experiment Station. 



77 



the numbers in both cases are practically the same. In the case 

 of the other three cows the numbers obtained after the machine 

 cleaning are higher than after hand cleaning and the grand averages 

 are 689 and 1140 per cc. respectively. This shows an increase of 

 65 per ct. in the germ content of the milk after machine cleaning 

 as compared with that after hand cleaning. 



A second comparison of the effect of hand and machine cleaning 

 was made between December 8, 1911, and January 6, 1912, and 96 

 samples of milk were examined. The conditions of the experiment 

 were practically identical with those of the preceding one except 

 that in the interval the stable had been freshly whitewashed and 

 painted. The germ counts from these samples are given in Table XIV. 



Table XIV. — Bacteria in Milk from Cows Cleaned by Hand 

 or by Vacuum Cleaner. 



Here the results from Gertie F. No. 2 and Gertie F. No. 1 

 are in favor of machine cleaning. In the case of the two other 



