10 



DAIRY LABORATORY GUIDE 



Allow the milk to drop from the opposite end of the 

 pipette by loosening the finger slightly until the edge 

 of the meniscus (rim of the crescent surface) touches 



-50 



|20 



flO 



l-o 



W 



FIG. 11. Whole Milk 

 Test Bottle 



FIG. 12. Cream 

 Test Bottle 



the 17.6 c.c. mark. Then place the contents of the 

 tube into a whole milk test bottle, adding 17.5 c.c. 

 of commercial sulphuric acid from a graduated bottle 



FIG. 13. Rack for Babcock Test Bottles 



NOTE. For cleaning discolored test bottles add 1 Ib. 

 good washing powder to a gallon warm water. Fill 

 bottles one-third full and add 1 c.c. sulphuric acid 

 to each. 



