“Another cause of difference in tests, and we think this is a very important one, is found in the condition of the milk when received at the factory. Some farmer’s milk, when brought in, is smooth and homogeneous; some bring in milk which is slightly churned; that is, there are small particles of butter, which is separated butterfat floating on the surface. This latter milk is very hard to sample; the sampler is plunged into the milk and is likely to miss a due proportion of these floating particles. In addition, some of the separated butterfat is sure to be left behind, both on the sides of can and on the cover. Butterfat adheres to any surface much more rapidly than any other of the milk solids. It is quite evident that milk which is partially churned will get a lower test at the factory than it did at the farm before it became churned. “In order to prevent this churning, it is most important that the milk be quickly and thoroughly cooled after milking. If milk is poured into cans and stirred and handled in a half warm condition, it is sure to separate to some extent. While the particles of butterfat are not large enough to be particularly noticeable, they are there and adhere to the surfaces as described. “Another condition which causes trouble in sampling, is found where some of the cream is firm and floats around in hard lumps but is not churned. This kind of cream is also hard to sample and these lumps are liable to be left behind on the sides of the can and cover. We believe this condition is caused by allowing milk to cool spontaneously. That is, instead of cooling quickly, the farmer fills up his milk can and lets it stand to cool slowly. This is liable to give a hard cream on the surface which does not break up readily. The farmer, therefore, will get a better test by =cooling his milk quickly and thoroughly and refraining from using the top milk for family use=. “We have come to this conclusion, namely, that certain conditions affect cows and their work, the same as that of human beings. As someone has said: ‘Put yourself in a cow’s place and try to get her point of view. Could you do good work if a swarm of flies were bothering you all the time? What effect does an extremely warm day or two have on your capacity for work? If you were out in a cold, rain, and wind storm, how would it affect your work? Suppose you were thirsty and had to wait two or three hours before you could get a drink and then got foul and stagnant water? Or, suppose that someone stronger than yourself would chase you away from the shade or sheltered spot or forced you to move when you were resting or eating? Suppose you were forced to eat food that you did not like or enjoy? How long would it be before these things would show in your work? Any or all of them would impair your efficiency and lessen your ability.’” CHAPTER VII. SUGGESTIONS FOR CONSTRUCTING A BARN.