DAIRY HUSBANDRY 
67 
SERIES E. 
Quality Tests (Special) 
Materials necessary for 10 students: 
1—Sediment tester and cotton disks. 
. 100 — 5" test tubes. 
100 cc.—Methylene blue solution (1 part crystalline dye in 2000 parts 
water. Redilute just before use so that the concentration is 
1 part dye to 20,000 parts of water). t 
300 cc.—ethyl alcohol solution (60% by weight: 68% by volume). 
1 — Incubator. 
*1—Marschall rennet testing set. 
EXERCISE NO. 51 
Object: To become acquainted with the Wisconsin sediment test for milk. 
Procedure: Aside from a knowledge of the fat content and the acidity 
of the milk, it is highly important that some test be used 
whereby the consumer or manufacturer may establish the care 
that the milk has been given in regard to cleanliness. For this 
purpose the sediment test is widely made use of by city milk 
plants, cheese factories and condenseries. 
A. Place a specially prepared cotton disk on the wire screen of the 
sediment tester and force one pint of the milk to be tested 
through the cotton disk. Paste the disk on one of the cards 
provided and hand in with the exercise. 
Observations: 
Conclusions: 
* 
Questions: (1) Outline how a farmer may produce milk with a good 
sediment test. 
(2) What is the result when dirty milk is used for cheesemaking? 
(3) What is a milk clarifier and how is it used. 
(4) Is a good sediment test always an indication that the milk is 
good? Explain your answer fully. 
References: F. & W. *[ 298; Van S. pp 163-168; St. pp 144-145. 
