186 



EXPERIMENT STATION RECORD. 



particle to particle is weakened when it lias to act through a greater distance upon 

 these particles. None of these clots in diluted milk has the absolute laxity of the 

 pancreatic clot in milk. . . . 



" I have confirmed Budin'a observations as to the superior digestibility of milk 

 heated to 100 C. . . . 



"Milk boils at 104.5 C. I have corroborated the statement that fresh milk yields 

 a blue color with tincture of guaiac, while boiled milk does not. 



•• I am unable to substantiate the statement of authors that boiled-milk is ■ far 

 more difficult to coagulate than unboiled milk.' . . . 



"Authors state that this ' difficulty ' is due to some of the calcic phosphate having 

 become insoluble. I can find none of it upon prolonged centrifugalization." 



Some investigations concerning separator slime, Barthel (Word. 

 Mejeri Tidn., 12 ( 189? ), Nos. 12, pp. 495, 496; 43, p. 507, ill.).— The author 

 discusses the formation and composition of separator slime, and shows 

 that the slime will vary in amount and character according- to the care 

 taken in drawing and handling the milk. The difference between the 

 bowl slime deposited on the inner wall of the Alpha separator bowl and 

 the "separator dirt," the deposit found at the lower end of the central 

 inlet tube serving as a stand for the Alpha discs, is considered. The 

 latter is dark gray, of a sandy and dry consistency, and contains mac- 

 roscopic impurities, like parts of insects, animal and human hairs, par- 

 ticles of wood, etc. Viewed under the microscope it is found to contain 

 more solid impurities and less casein and bacteria than the bowl slime, 

 and is especially rich in epithelial cells, which occur only in small quan- 

 tities in the bowl slime. The separator dirt makes up from 4 to 8 per 

 cent of the total quantity of slime. The difference in the ash contents 

 of the two kinds of slime is marked. The dry substance of the bowl 

 slime was in one instance found to contain 7.1 per cent of ash, against 

 14.1 per cent in the dry matter of the separator dirt. 



The total amount of separator slime obtained in 50 trials varied from 

 0.02 to 0.04 per cent of the milk separated, the average amount being 

 0.03 per cent. The average water content was 05 per cent, with varia- 

 tions from day to day of 3 to 4 per cent. The machine used was a 

 Turbine Alpha-Pony separator. 



The relation between the separating temperature, the acidity of the 

 milk, and the amount of slime obtained is shown by the following 

 results : 



Relation between temperature, acidity of milk, ana" amount of slime. 



The increase in percentage of slime with increasing acidity of the 

 milk is due to the greater separation of the casein under these condi- 



