170 



MAINE AGRICULTURAL EXPERIMENT STATION. 



from a syphon affixed to a bottle or carboy. Mix the acid and 

 cream together thoroughly, which is best done by grasping the 

 neck with the hand, pressing the thumb tightly over the open- 

 ing and then giving the bottle a rotary motion, holding it 

 upright all the time. The confined air prevents the curd from 

 coming up and sticking to the sides of the neck. The mixing 

 is just as easily done in this as in the old style bottle. The 

 remainder of the process is conducted exactly the same as for 

 testing milk previously given. 



If the above directions are followed, a perfectly clear separa- 

 tion will be obtained and also a considerable saving of time over 

 the old method, as only one pouring of the acid and one whirl- 

 ins: of the machine are made. 



WEIGHING CREAM FOR THE TEST INSTEAD OF MEASURING. 



Cream containing twenty-five per cent, of fat or less when 

 sweet and not frothing can be measured with sufficient accu- 

 racy to give good results. But when such cream becomes sour 

 it is impossible to get it in condition to measure without a good 

 deal of trouble. If it is simply broken up by shaking, as is 

 often done, it will contain so many air bubbles that the cream 

 drawn into the pipette will weigh less than 18 grams. To illus- 

 trate what a difference there is the writer made several tests of 

 sweet cream, then the same samples were allowed to stand in 

 the jars until sour, broken up by simply shaking and tests made 

 by both weighing and measuring out the samples. • 





** g 2 



oh* 

 a d 



GO s 



£ 



P 2 £ 

 m 3 £ 



c'i'l 



co o ? 



No. 1 



18 

 20h 



16 

 18* 



184 



No. 2 



No. 3 



20J 







Thick separator cream, which will always contain air bubbles 

 if stirred enough to get a good sample, cannot be accurately 

 measured and must be weighed to get a reliable result; and the 

 writer has become thoroughly convinced that it is necessary for 

 every creamery to have some means at hand to test such cream 



