26 



MODERN METHODS OF TESTING MILK 



fruit- jars mav be used. Whatever form of composite- 

 sample jar or bottle be used, the stopper or cover 

 should fit perfectly tight, so as to prevent any possi- 

 ble evaporation of water from the sample of milk, 



and care should be 

 taken to keep the 

 covers or stoppers 

 tight. Each sam- 

 ple-bottle or jar 

 should be labeled 

 with a name or 

 number easily iden- 

 tifying the patron 

 furnishing the milk. 

 The jars should be 

 arranged in definite 

 order on a rack 

 (Fig. 3), placed 

 conveniently near the point where the milk is deliv- 

 ered. As explained later, some preservative is used 

 in each jar. 



Taking daily samples for composite samples. — 

 Each day when milk is delivered, the sample should 

 be taken immediately after the milk has been poured 

 into the weighing can before weighing, and should 

 then be placed at once in the composite jar or bottle 

 prepared for it. Two methods of sampling are in 

 common use, (i) by means of a small dipper, and (2) 

 by means of a sam])ling-tube. 



(i) Taking sample icith dipper. — A half-ounce dip- 

 per (Fig. 4) is used for taking the sample from the 

 weigh-can, as soon as the milk is poured in. The 



FIG. 3 — RACK FOR COMPOSITE SAMPLES 



