134 PROFITABLE DAIRYING 



sunlight are the surest means of preventing germ 

 diseases in the dairy herd. 



EXERCISES 



1. Why is fresh air admitted into a barn near the 

 ceiling ? Why not open a window ? 



2. Why does the outlet flue extend to within one 

 foot of the floor? 



3. Why not admit fresh air under the door and 

 draw off bad air from the ceiling? 



4. Why not use the hay chutes for ventilating flues ? 

 Should hay chutes be open or closed while cattle are in 

 the barn? 



5. What provision do you have for ventilation in 

 the home barn ? 



6. Would it be possible to install a ventilating sys- 

 tem in your barn ? If so, how ? 



LABORATORY PROBLEMS 

 XXII. To Determine the Per Cent of Water in Butter 



According to a rule made by the Department of Agri- 

 culture at Washington, creamery butter containing 16 

 per cent or more of water is considered adulterated and 

 is subject to a tax. It is therefore very important that 

 butter should be made that will contain less than this 

 amount of water. It is an easy matter to determine 

 the water content of butter, but great care must be exer- 

 cised to have the samples representative. 



1. By means of a trier small lots of butter should 

 be taken from different parts of the tub. These lots 

 should be placed in a small, wide-mouthed, stoppered 

 bottle. This butter should then be heated so as to 



