New Yoke: x\geicultueal Experiment Station. Go 



torily cleaned. It should be noted, however, that in the above tests 

 but a single cow was milked into each pail. The influence of this 

 initial contamination would undoubtedly have been very much less 

 in the case of succeeding cows milked into the same pail. On the 

 other hand the pails in this experiment were kept under fairly clean 

 conditions and the amount of contamination to which they were 

 exposed was slight compared with pails in ordinary dairy practice. 

 In the light of these results all of the pails used in the following 

 experiments were carefully protected with cloth up to the moment 

 when they were desired by the milker since the aim in this work 

 was to determine the contamination occurring during the milking 

 process. 



EFFECT OF PLASTERING AND WHITEWASHING STABLE. 



One of the newer things in dairy barn construction is the finishing 

 of the interior of the cow stable with lath and cement. This con- 

 struction insures a tight ceiling and a smooth interior to which little 

 dust can cling. It has the added advantage of a light interior, the 

 whiteness of which can be cheaply renewed by whitewash. In new 

 construction this finish has much to commend it since it is satisfac- 

 tory from the sanitary point of view and is one of the cheapest 

 methods of tightly ceiling up the interior. 



The Station barn was constructed in 1904. The cow stable was 

 ceiled at the top and sides with planed, beaded, matched, southern 

 pine. This wood was finished with a coat of oil and shellac which 

 was in accord with accepted dairy stable construction at that time. 

 Such construction is not as highly considered at present because of 

 the attention now given to the collection of dust in the cracks between 

 the boards and in the depressions of the beading. The stanchions in 

 this stable are the " Drown stalls "which were designed before atten- 

 tion to stanchion construction was directed toward avoidance of 

 dust accumulation. 



In order to contrast the effect of this older construction under 

 unfavorable conditions with the newer at its best, dust was allowed 

 to accumulate on walls, ledges and stanchions until they were in as 

 bad a condition as would be tolerated under reasonably good barn 

 management. 



As a measure of the influence of this condition of the barn the germ 

 content of the milk on June 6-11, 1910, was determined from six cows 



