2 84 MILK AND THE PUBLIC HEALTH ciap. 



type of uiilking-iniichine. It is true that iiiilking-iuuebines 

 have heeu tested by bacteriologists, and reported upon favour- 

 ably by some although others ha,ve reported adversely, Ijut in 

 such hands cleansing would be thorougli and very dilferent 

 from the routine cleansing of actual daily use. 



The careful report of AVoll and Humphrey^ may be quoted 

 as :xn example of such an investigation. They tested the 



Fii;. 2''. — .Milkin;; .Macliine. 'lu sliow 



etl](.til i-il (.■leaniiiL; Um- iii;ichiiie ami its (■(niiipctidns. 



Burrell- Lawrence -Kennedy Cow ]\Iilker (V>. L. K. jMilker). 

 Forty separate trials were made, and the 29 cows of the 

 University herd were milked continuously l)y the machine for 

 an average of 20 weeks. The macliine acts by suction, in 

 imitation of the sucking of the calf. The air is partially 

 exhausted by means of a vacuum pump from a tightly covered 

 milk pail, which is connected ijy rulil.ier tuliing with a system 

 of piping extending in front of the cows' stalls. The milk 

 pail is connected with the cow's udder by means of a rubl.ier 



' }ris::on!!iii rnicci-silij A'jricullaral Experiment Station, 1909, HcscmrJi 

 Ballrlin Xo. 3. 



