1902.] STORRS EXPERIMENT STATION — DAIRYING. 263 



in milk just as they have learned that the Ben Davis apple is 

 not the New England-grown Baldwin or the sickel pear. 

 Milk is not always milk, and in some cases, at least a few, 

 and I am glad to say that these are getting less and less, 

 where milk is being put upon the market to be used as food 

 it is being returned to the seller through whose lax methods 

 it derived a part of its flavor. 



So far as I know, no one has ever made any special scien- 

 tific study in regard to the amovmt of filth and other dirty 

 stufif that is contained in milk. That is the first problem 

 that we undertook to get some light upon, and the first thing 

 to do was to find some method whereby we could tell what 

 a certain quantity of milk contained. The first method that 

 was tried was to place a certain quantity in a tall glass cyl- 

 inder with straight sides, and let it stand for a number of 

 hours until the particles of dirt contained in the milk had 

 had time to settle to the bottom', and then by means of a little 

 rubber tube the upper part of the milk was syphoned of¥, the 

 cylinder again filled with water, this in turn allowed to stand 

 for a certain number of hours, and then again syphoned of¥ 

 and the cylinder refilled; this washing or diluting process 

 going on long enough to remove the cream and fat and to 

 make the liquid thin enough so that it could be washed 

 through filter paper, where the dirt might be collected and 

 dried and weighed. This process did not prove to be very 

 satisfactory, because it was found that the particles of dirt 

 would stick to the sides of the cylinder and would not sink to 

 the bottom. It was also found that fine particles were held 

 near the top, being held in with the cream, so that the cream 

 could not be taken off without carrying ofif some of the dirt. 

 That process had to be abandoned. 



Next we tried to see if we could not throw the dirt out 

 by using a Babcock testing machine. In this the milk was 

 put into a boHle, the machine \vhirled rapidly for a few min- 

 utes, which precipitated the dirt to the bottom, and then by 

 means of a little rubber tube and the same washing process 

 we got the liquid thin enough so that we could wash it 

 through filter paper. It was found that the ordinary Babcock 

 testing machine did not run fast enough to throw all of the 

 dirt to the bottom. Some particles would rise up and be 

 caught in with the fat. So that plan had to be abandoned 



