358 ELEMENTS OF FARM PRACTICE 



Productive Dairying, R. M. Washburn. 

 Dairy Laboratory Guide, G. L. Martin. 



Poultry 

 Principles and Practice of Poultry Culture, J. H. Robinson. 

 Productive Poultry Culture, H. R. Lewis. 

 Poultry Production, W. A. Lippincott. 



Miscellaneous 

 Farm Boys and Girls, W. A. McKeever. 

 How to Live in the Country, E. P. Powell. 

 Rural Improvement, F. A. Waugh. 

 Work of the Rural School, Eggleston and Briere, 

 Rural Hygiene, H. W. Ogden. 

 School Hygiene, F. B. Dressier. 

 Farmer's Law, L. V. Koos. 

 Home and Community Hygiene, J. Broadhurst. 

 How to Co-operate, Herbert Myrick. 

 Poems of Country Life, Collection by G. S. Bryan. 



DIRECTIONS FOR BABCOCK TEST. 

 Milk-Testing Outfit. 



2 pipettes with capacity of 17.6 c.c. 1 tin cup with spout 



12 Babcock milk test bottles 1 twelve-bottle tester 



2 skimmed milk test bottles 1 gallon sulphuric acid 



2 acid measures with capacity of 17.5 c.c. 



Where the milk of only one or two cows is to be tested, the four- 

 bottle tester is sufficient, but the covered twelve-bottle tester is safer 

 and its temperature is more easily maintained. 



Mix the milk thoroughly by pouring and fill pipette to the grad- 

 uation, holding the finger over the upper opening. 



With the vessels at a slant, and releasing the finger, allow all the 

 milk to flow into the bottle. It should not be warmer than 60-70 degrees 

 Fahrenheit. 



Fill the measuring cylinder to the graduation with sulphuric acid 

 testing 1.82 (special for this test) and pour into the bottle. 



Shake the mixture vigorously about one minute after all the curd 

 has disappeared. The bottle will get hot. Use caution, as the acid 

 is corrosive and dangerous. And do not use pipette for acid. 



Place the bottles in the centrifuge, or tester, cover and, after heating 

 it on the stove or by adding a few quarts of boiling water, whirl for five 

 minutes at the rate of eighty revolutions a minute. If the tester is 

 not full, the bottles should be balanced in opposite positions. 



With the tin cup fill the bottles nearly to the base of the neck with 

 water that is nearly boiling hot and whirl again for one minute. 

 Fill with hot water to 7 or 8 on the neck and whirl one minute. 



Take the readings at once. Subtract the reading on the scale 

 at the bottom of the fat column from the reading at the top of it. 

 The difference is the percentage of fat in the milk. 



