GLOSSARY 353 



Inoculation. — To seed, to transplant; as to inoculate 

 milk with lactic acid germs. 



Insulation. — The state of being protected from heat and 

 cold by non-conducting material. 



Lead. — The amount of opening of the steam ports when 

 the engine is on the dead center. 



LoppERED Milk. — Milk that has thickened. 



Mammary Gland. — The organ which secretes milk. 



Medium. — The substance in which bacteria live. Thus, 

 milk furnishes an excellent medium for the growth of 

 bacteria. 



Meniscus. — A body curved like a first quarter moon. 



Milk Serum. — Milk free from fat. Thus, skim-milk is 

 nearly pure milk serum. 



Mixing Cans. — Small tin cans used for mixing milk pre- 

 paratory to testing. 



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. 



Parturition. — The act of being delivered of young. 



Pasteurization. — The process of destroying all or most 

 of the vegetative bacteria by the application of heat 

 from 140° to 185° F. 



Period of Lactation. — The time from calving to ''dry- 

 ing up." 



Physical Properties. — The external characteristics of a 

 body, like color, odor, hardness, solubility, density, 

 form, etc. 



Propagate. — To continue to multiply. Thus, to propa- 

 gate a starter means to continue multiplying the lactic 



