248 



FARM AND SCHOOL PROBLEMS. 



NOTE. Agricultural apparatus is' not complete without a milk- 



tester. 



Questions. 



1. Make a list of the products of milk. 



2. What causes milk to become sour? 



3. What effect does cooling the milk have on keeping it sweet? 



4. What are lactic-acid bacteria? 



5. Describe various ways by which disease germs get into milk. 



6. What part do bacteria play in the making of cheese? 



Selecting a Cow from Physical Characteristics. 



Courtesy Washington Experiment Station 



FIG. 8. 



Fig. 8, is an excellent model of a splendid dairy type. Look- 

 ing at this figure we may note some of the following charac- 



teristics : 



1. A clean face, broad forehead, a large bright intelligent eye 

 and prominent veins. 



2. A thin neck, sharp lean shoulders, prominent hips and thin 

 thighs. 



3. A spare form throughout with great depth of body. 



4. A great development of milk vein extending from the front 

 legs along the abdomen to the udder. 



5. A splendidly developed udder. 



