QO MODERN METHODS OF TESTING MILK 



small bent tube inside the bulb. The water is then 

 poured from the condensing jacket, after which the 

 jacket may be removed. 



(9) Separating amyl reagent from water. Some 

 amyl reagent is distilled with the water, but does no 

 harm as they can be easily separated. This is done as 

 follows: Hold the receiving bulb in the palm of the 

 hand and the stoppered end away from the body ; then 

 raise to a horizontal position and swing at arm's length 

 sharply downward to the side. This is repeated several 

 times until the line of separation between the water 

 and amyl reagent is sharply distinct, no amyl reagent 

 being seen with the water, or vice versa. The tube 

 should then be held a short time with the stoppered 

 end downward and the amyl reagent in the bulb agi- 

 tated in order to rinse down any water adhering to 

 the sides of the bulb. 



(10) Reading the test. After cooling the tube and 

 contents, the percentage of water may be read directly 

 from the scale, when a lo-gram sample is used. The 

 water is in the bottom of the tube. The reading is 

 made to the lower part of the meniscus. 



Cleaning the apparatus. The flask and tube should 

 always be perfectly dry before being used. An occa- 

 sional cleaning with washing soda in hot water or 

 other cleansirig mixture will keep the apparatus suffi- 

 ciently clean. After making the test, tube C is emptied 

 by holding the stoppered end downward, removing the 

 stopper and allowing contents to flow out quickly. The 

 tube is further cleaned and dried by swinging in the 

 manner described above under (9). 



