30 MODERN METHODS OF TESTING MILK 



side, such a pipette will furnish a sample amounting to 

 17.5 cc. of milk, which weighs about 18 grams, I cc. 

 of milk weighing about 1.03 grams on an average. 

 The accuracy of the test, so far as regards the amount 

 of sample taken, depends upon the exactness of the pi- 

 pette in holding 17.6 cc. The mark on the stem should, 

 for convenience, be two inches or more from the up- 

 per end of the pipette 



MEASURE FOR ACID 



A cylinder of glass, like that shown 

 in Fig. n, with a lip to pour from and 

 a single mark at 17.5 cc., is the form 

 commonly used. Other forms are shown 

 in Figs. 12 and 13. These latter forms, 

 made so as to hold enough acid for 20 



J 



FIG. 9 

 AUTOMATIC PIPETTE 



FIG. 10 



WAGNER'S PIPETTE 



FIG. II 

 ACID-MEASURE 



