Grade 



Date. 



(32) 



EXERCISE 13 



Object. — To determine the effect of not mixing a sample previous to testing. 

 Apparatus. — Sample of milk that has stood for an hour or two without 



being stirred; the Babcock test outfit. 

 Step 1. Without disturbing the sample of milk on the desk, draw two samples 



from the top. 

 Step 2. Draw two samples from the bottom. 

 Step 3. Mix the milk thoroughly by pouring; take two samples. 

 Step 4. Add proper amount of acid to each, mix and complete the tests. 



Report. 



1. Explain below what would be the losses to a creamery receiving 

 45,000 pounds of milk daily if the above careless methods were used in test- 

 ing the samples, supposing the sample was taken from the top. 



2. What loss to patron if sample is taken from bottom? 



3. What would be the percentage of error in the above tests? 



