THIRTY-SIXTH ANNUAL CONVENTION. 261 



oi dividers. An entire outfit large enough for a herd of not over 

 20 cows can be purchased for from $4.00 to $9.00. In using the 

 pipette, it will be found convenient to push a piece of pure gum 

 rubber tubing over the large end of the pipette about one-half 

 inch, leaving about one inch projecting. Ordinarily no rubber 

 tubing used, the pressure of the finger on the end of the pipette 

 regulating the outflow of the milk. 



Thoroughly mix the sample to be tested by pouring back 

 and forth from the sample jar to a clean cup or jar at least six 

 times and until no fat is left adhering to the walls of the sample 

 jar. Be careful not to spill any of the milk. Draw the pipette 

 nearly full of milk by sucking with the lips. Squeeze the rubber 

 tube above the glass until the milk is held when the lips are re- 

 moved. Allow the milk to escape by varying the pressure on the 

 rubber tube until the milk on the pipette is reached. Transfer the 

 milk carefully to one of the test bottles. Mark the number or 

 name of the cow on the small ground spot on the bottle. Be sure 

 all the milk runs out of the pipette. 



It is a good plan to measure out two samples for each cow, 

 in case one bottle. should be broken while making the test. The 

 reading on the two bottles should not vary over one small space 

 or .2 per cent. 



Have some scalding hot water convenient. 



Adding the Acid. 



Commercial sulphuric acid is used. This may be obtained 

 from any druggist or in large quantities from a creamery supply 

 house. 



Fill the acid measure up to the mark and pour into the test 

 bottle. Hold the bottle in a slanting position so that the acid 

 will run down the neck and under the milk. Rotate the bottle 

 slightly while pouring in the acid to wash down any milk that 

 adheres to the inside of the neck. When the acid is added, mix 

 the milk and acid with a gentle rotary motion taking care to pre- 

 vent slopping the mixture into the neck. Mix until all the white 



