70 MILK AND DAIRY PRODUCTS PART 



The following apparatus and reagents are required for Gerber's 

 " acidobutyrometric " method : 



(1) Test-bottles of glass. These have a wide main portion, 

 which is joined to a graduated tube ending in a conical 

 expansion (see Fig. 31). 



(2) Pipettes to measure out milk, sulphuric acid, and amyl 

 alcohol. The pipette for the milk holds 11 cm. (see Fig. 32), 



Amyl 

 Alcohol. 



Fits. 32. -Pipettes for Milk, 

 Acid, Amyl Alcohol. 



FIG. 33. Automatic Measurer of 

 Sulphuric Acid and Amyl 

 Alcohol. 



and the one for the acid 10 cm. This latter is provided with 

 two bulbs, which prevent the entrance of acid into the mouth 

 when the pipette is being used. For amyl alcohol the pipette 

 holds only 1 c.c. Various forms of apparatus designed to 

 automatically measure the sulphuric acid, and also the amyl 

 alcohol, have been invented, but a description of them is not 

 necessary here. Two of the most useful are shown in Figs. 33 



