A DAIRY LABORATORY GUIDE 39 



EXERCISE VII 



BABCOCK TEST AND B. OF H. 

 LACTOMETER 



1. Take the B. of H. lactometer reading and 

 make a Babcock test of a sample of whole milk. Re- 

 move the lactometer, and allow the milk to stand in 

 your lactometer cylinder while you do No. 2. Then 

 draw off from the top of the sample all the cream 

 the pipette will hold. Then add to the sample 17.6 

 cc. of water and mix thoroughly. Again take a lacto- 

 meter reading and make a Babcock test and figure 

 out the per cent of fat removed by skimming and 

 the per cent of fat removed by watering; make 

 the test in the whole milk bottles. After drawintj; 

 oflf cream and adding water be sure to mix the sam- 

 ple thoroughly. Upon what rule does your ability 

 to do the above computation depend? Better results 

 will be obtained if the milk is warmed to about S5° 

 F. and allowed to stand as long as possible. In re- 

 moving the cream keep the point of the pipette as 

 near as possible to the surface of the liquid. 



2. Test in the steam machine whole milk, skim- 

 med milk and cream. Run the skimmed milk ten 

 minutes, two minutes and one minute, and use acid 

 one-quarter inch above the mark on the acid meas- 

 ure. Retest the whole milk in the hand machine 

 and compare the results with those obtained in the 

 steam machine. 



3. (a) Take the B. of H. lactometer reading 

 of a sample of skimmed milk. See how much water 

 it will take to lower the lactometer reading one 

 (Ict^Tce. Great care must be taken to mix the water 

 with the milk as the former is poured in. This is 



