24 MODERN BUTTER MAKING. 



of the neck of the bottle. After adding the acid, 

 the bottle should at once be given a rotary motion 

 to the right and to the left, until the milk and acid 

 are well mixed. The mixture should then have a 

 dark, but not a black color. If the color is too 

 light, add a trifle more acid; if too dark, use .less 

 acid the next time. 



20. Apparatus used for measuring acid into test 

 bottles. It is not only necessary to use accurate ap- 

 paratus for measuring sulphuric acid into the test 

 bottles, but it is most desirable to have a reliable, 

 accurate and convenient contrivance, by vi^hich sul- 

 phuric acid can be safely and quickly added to the 

 milk or cream to be tested. Sulphuric acid is a 

 dangerous fluid to handle and great care should be 

 exercised vs^hen using it. For the successful hand- 

 ling and measuring of it into test bottles, various 

 acid bottles, tubes and dippers are novp on the mar- 

 ket. Information regarding these may be had by 

 addressing any reliable creamery supply house. 



The practice of using a pipette for measuring 

 acid into test bottles should be condemned. While 

 one may not meet with an accident, there is always 

 danger of making a mistake unexpectedly and en- 

 dangering one's life by forcing acid over the stem 

 of the pipette into the mouth and throat. 



21. Whirling the bottles and adding hot vsrater. 

 Be sure to have an equal number of bottles directly 

 opposite each other in the tester, in order to have a 

 true balance. If this is not done the tester may 

 run unevenly and may spoil both the test and tester ; 

 or it may break the bottles. 



