DAIRY HUSBANDRY 
29 
SERIES C. 
Testing cream for fat 
Materials necessary for 10 students: 
100 cc. glymol or “red reader .” 
EXERCISE NO. 21 
Object: To become acquainted with one method of testing cream with the Bab¬ 
cock test. 
Procedure: “Cream may be tested by the Babcock test in the same man¬ 
ner as milk, and the results obtained are accurate when neces¬ 
sary care has been taken in sampling the cream and measuring 
the fat.” (F. & W. H 85.) 
A. Carefully balance a 30% cream test bottle on the balances 
provided. 
B. Weigh out exactly 18 grams of a well mixed lot of cream. 
Make all tests in duplicate. Add approximately 16 cc. of sul¬ 
furic acid and test as whole milk. 
C. Place the bottles in a hot water bath (135°-140° F.) for 5 min¬ 
utes and read immediately by including all of the lower 
menicus and one-third of the upper meniscus. 
D. Replace bottles in the water bath for 5 minutes, and add a few 
drops of glymol (colored Petrolatum) and read, including both 
extremes of the fat column. 
Observations: 
Sample 
%fat 
Color 
Condition 
1 
a 
b 
2 
a 
b 
Conclusion: 
Questions: (1) What is the size of the smallest graduation on the neck 
of a 30%, 6-inch, 18 gram test bottle? 
(2) What is the object of using glymol or “red reader” before read¬ 
ing cream tests? 
(2) When should glymol be added to the fat column? 
(4) How should cream tests be read without glymol? Outline the 
various suggestions. 
References: F. & W. If 85-89 inclusive; Van S. pp 73-92; Jud. pp 75-85; 
St. pp 119-128. 
