New York Agricultural. Experiment Station. 75 



It will be seen from Table I that these marked changes in the 

 vacuum produced no correspondingly marked changes in the flow 

 of milk. 



During tlie 44 days covered by this experiment there was a 

 marked decrease in flow in the case of Ruth, a smaller decrease 

 with Millie D. and practically none at all with Gertie. There is 

 a close connection between this decrease in flow and the period 

 of lactation of the cows. Ruth F. who gave 4.12 lbs. of milk per 

 day less during the last week of the experiment than during the 

 first was then within 29 days of the close of her lactation period. 

 Millie D. who during the same time had decreased her daily flow 

 only 1.99 lbs. continued in milk 42 days after the close of this 

 experiment, while Gertie F. ISTo. 2, whose milk flow did not de- 

 crease during the experiment, gave milk for 92 additional days. 



