MODERN DAIRYING 



sand and while fine results are obtained in 

 filtering water through as deep layers of sand 

 as this milk passes through, yet it is pointed 

 out in a bulletin issued by the Maryland Sta- 

 tion that such filtering of milk does not by 

 any means give as good results as might be 

 expected. "Milk" as the bulletin puts it, "has 

 a strange affinity for dirt and seems loath to 

 give up that which it holds in suspension. A 

 peculiar exposition of the characteristic of 

 milk was noticed in some work done at this 

 station in trying to remove the garlic odor 

 from milk. The milk was filtered through 

 bone-black, but came out as black as the char- 

 coal through which it had passed. Water, 

 made turbulent by the finest clay, was run 

 through this same filter and came through 

 clear as crystal. It was finally found that 

 charcoal, granulated and washed as free from 

 dirt as possible by agitating in water, would 

 still cause the milk to turn black when run 

 through it. To this same characteristic is very 

 likely due the fact that the best sand filters 

 will not remove all of the dirt from the milk. 

 Filters seem never to have come into use in 

 this country, or there has at least never been 



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