1902.] DISCUSSION, 265 



at the end we had a series of results which could be, I think, 

 compared with a fair degree of accuracy. The results of 

 these experiments were in some respects quite marked. The 

 amount of dirt getting into the closed pail was very much 

 smaller than that getting into the open pail. 



I have brought along two or three samples of the filter 

 papers on which we collected the dirt, thinking possibly you 

 might be interested in looking at them and making a com- 

 parison between the two. 



Secretary Brown. Would you be willing to tell right 

 here how large the samples of milk were from which you got 

 the amount of dirt as shown on these filter papers? 



Mr. Stocking. Just a trifle over a quart. I would say, 

 however, that the cows that those samples were taken from 

 were giving at the time these tests w^ere taken about seven 

 pounds of milk at a milking, so that, of course, to get the 

 amount of dirt in one milking that would have to be multi- 

 plied. 



Question. Were those cows kept as clean as possible, 

 or were they kept the same as the ordinary farmer would 

 keep his cows? 



Mr. Stocking. They had the same ordinary care that 

 all the cows in the barn had. 



A Member. They were not, then, thoroughly cleaned 

 and groomed twice a day? 



Mr. Stocking. Of course, during the time that they were 

 out to pasture they were not groomed. Some of these tests 

 were taken at that time. 



Question. Was that milk, from which the samples were 

 taken, strained through cloth, or strained in any other way? 



Mr. Stocking. No sample was strained at all. These 

 filter papers show the amount of dirt that got into the milk 

 at the time of milking; that is, that got into the samples from 

 which this dirt was gathered. That is what we were after. 

 I might also say that the barn in which these cows were kept 

 was probably cleaner than eight out of ten ordinary farm 



