ON MILK AND MILK-TESTING 39 



2. It varies in per cent represented by the 

 smallest divisions on the scale, which, in some 

 bottles, are equal to i per cent, while in others they 

 represent two-tenths of i per cent. 



3. When a cream bottle is made with a bulb in 

 the neck, the bulb usually represents 10 per cent, 

 and is not otherwise graduated. The graduated 

 portion above and below the bulb may be graduated 

 as fine as two-tenths of i per cent. 



What should be the capacity of cream test bottles? 

 The part below the neck should hold about 50 

 c. c, even though only 9 grams of cream are used 

 in making the test. 



How should the pipette be made? 



1. Of tough glass with a strong annealed tip, 

 and having an opening large enough to allow the 

 milk to run out freely, yet not so large as to flood 

 the neck of the test bottle. 



2. The tube below the body should be about 

 4 inches long, and small enough to enter the neck 

 of the bottle. 



3. The space between the upper end of the 

 pipette and the mark on the stem should be large 

 enough so that after filling the pipette, one will 

 have time to place the finger over the end before 

 the milk runs below the mark. 



How much milk should the pipette deliver? 



It should deliver 18 grams of milk, or 17.44 c. c 

 18-7-1.032 (sp. g. milk)=i7.44. 



