THE EARTH'S BOUNTY 



The Babcock test for butter fat is simple, 

 accurate, and costs very little. We bought 

 what, I think, was the smallest outfit for $6, 

 and it consists of four bottles, one pipette 

 for measuring the milk, another measure for 

 the sulphuric acid, and the machine itself. 

 The operation is simply to fill the pipette up 

 to the line indicating the required quantity 

 18 grams, pour it into the test bottle, meas- 

 ure the sulphuric acid, add to the milk, shake 

 until it turns dark. Then fit the bottle into 

 the machine, neck toward the center. Use a 

 separate bottle for the milk from each cow. 

 When all are in place, the handle of the ma- 

 chine has only to be turned rapidly, and the 

 joint action of the acid and the centrifugal 

 force drives the heavier constituents to the 

 bottom, and the fat particles, which are the 

 lighter, into the neck, where the exact amount 

 is indicated by the scale on the bottle. 



When a new cow is bought, or when one of 

 our own raising comes into milking, we use 

 the test night and morning, for one week, in 



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