10 



As there was practically no "stripping^" after the expert "manipula- 

 tion" of the udder, are we to conclude that "manipulation" secured all 

 the milk, or that it brought about a condition which prevented the hand 

 milker from securing- the "strippings" ? 



On October 19th those cows usally milked by the expert hand milker 

 were milked by the inexperienced milker, and the expert milker milked 

 those usually milked by the inexperienced person. The table shows that 

 of the cows milked by the inexperienced milker one cow increased two 

 pounds, two were the same as on the previous day milked with the ma- 

 chine, one cow gave one pound, and another two pounds, less milk by 

 hand than with, the machine. All the cows milked by the expert milker 

 gave more milk by hand than they did the previous day when these cows 

 were milked by an expert operating the milking machine. The total pounds 

 of milk given by the ten cows on October 18th was 226 pounds, when 

 the machines were operated by an expert. On October 19th, when hand 

 milkers were changed, the total pounds milk were 236 — an apparent in- 

 crease of ten pounds as a result of hand milking. 



On October 20th hand milkers were again changed. The expert hand 

 milker got 148 pounds milk from his five cows, and the inexperienced 

 milker got 94 pounds from his cows. On the 19th, with a change of hand 



