MlUtY BVTTUR MAKING 263 



acid bacteria by daily transferring them to a new 



medium such as sweet pasteurized skim-milk. 

 PROTEIDS. Nitrogenous substances like casein and albu- 

 men. 

 REDUCING VALVE. A valve used for regulating steam 



pressure. 

 REFRIGERANT. In mechanical refrigeration a substance 



whose evaporation produces cold. 

 RENNET. The curdling and digesting principle of calf 



stomach. 



SCORING. A term used synonymously with judging. 

 SECRETION. The act of separating or producing from the 



blood by the vital economy. 

 SEPTIC. Promoting decay. 

 SPECIFIC GRAVITY. The weight of one body as compared 



with an equal volume of some other body taken as 



a standard. 

 SPECIFIC HEAT. The quantity of heat required to raise 



the temperature of a body one degree. 

 SOLUTION. The state of being dissolved. 

 SPORE. The resting or non-vegetative stage of certain 



kinds of bacteria. 

 STEAM TRAP. An arrangement by which condensed 



steam may be taken out of heating pipes without the 



escape of steam. 

 STERILIZATION. The process of destroying all germ life 



by the application of heat near 212 F. 

 STRIPPERS' MILK. The milk from cows far advanced in 



the period of lactation. 

 STRIPPING*. The last few streams of milk drawn from 



each teat. 

 SUSPENSION. The state of being held mechanically in a 



liquid, like butter fat in milk. 



