THE ANALYSIS OF MILK 9 



tested and the lactometer removed, and allowed to 

 stand, it must be washed and dried before being used 

 for another sample. 



There is usually little objection, however, to removing 



FIG. 6. Thermo-lactometer. 



a lactometer from one sample and, after draining, 

 placing it at once in another sample ; but if the sample 

 is likely to be the subject of legal proceedings or is 

 otherwise important, the lactometer should always be 

 cleaned before testing. 



The Gravimetric Estimation of Specific 

 Gravity. Dry a Sprengel tube (Fig. 7) by washing 



