APPENDIX 291 



GALACTASE. An unorganized ferment in milk which di- 

 gests casein. 



MAMMARY GLAND. The organ which secrets milk. 

 MENISCUS. A body curved like a first quarter moon. 

 MILK SERUM. Milk free from fat. Thus, skim-milk is 



nearly pure milk serum. 



NEUTRAL. Possessing neither acid nor alkaline prop- 

 erties. 

 NON-CONDUCTOR. A material which does not conduct 



heat or cold, or only so with great difficulty. 

 OSMOSIS. The tendency in fluids to diffuse or pass 



through membranes. 

 RENNET EXTRACT. The curdling and digesting principle 



of calf stomach. 

 SECRETION. The act of separating or producing from the 



blood by the vital economy. 

 SPECIFIC GRAVITY. The weight of one body as compared 



with an equal volume of some other body taken as 



a standard. 

 SPORE. The resting or non-vegetative stage of certain 



kinds of bacteria. 

 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. 

 STRIPPINGS. 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. 

 TUBERCULIN. A sterile glycerine extract of the growth 



products of the tubercule bacillus. 

 VACUUM. Space devoid of air. 

 VEGETATIVE BACTERIA. Those bacteria that are in an 



actively growing condition. 



