184 Glossary. 



Fission. Division of a cell by direct partition. 



Formalin. A watery solution of formic aldehyde gas possessing 

 powerful disinfecting properties. 



Galactase. An unorganized ferment inherent in milk which digests 

 casein in ripening cheese. 



Germicide. Any substance capable of destroying germ life. 



Hydrophobia. A highly contagious disease, often occurring in 

 dogs, wolves, etc., but communicable to man. 



Hydrocarbons. Organic material like the fats and oils. 



Indigenous. Bacteria normal to any given habitat. 



Lange wei (slimy whey). A viscous fermentation of whey used as 

 a starter in Edam cheese. 



Mammalia. Animals that suckle their young. 



Mammitis. Inflammation of the udder. 



Matzoon. A fermented milk used largely in Armenia. 



Mother cell. A vegetable cell capable of reproduction. 



Obligate. Bacteria that are obliged to grow under certain condi- 

 tions. 



Optimum growth temperature. The best temperature for the 

 growth of any form. 



Parasites. Organisms subsisting on living matter. 



Pasteurization. The use of heat from 140 to 165 F. as a germ 

 destroyer. 



Pathogenic. Bacteria able to produce disease in living tissue. 



Pepsin. An enzyme capable of digesting proteids in acid solution. 



Peptones. Soluble products of nitrogenous digestion. 



Preservaline. A proprietary antiseptic composed mainly of boric 

 acid. 



Proteids Complex nitrogenous substances of an insoluble nature. 



Protoplasm. The living substance of organic tissues. 



Ptomaine. A complex nitrogenous product of bacterial growth. 



Pure Culture. A bacterial growth of a single species in a sterile 

 medium. 



Rennet. The curdling enzyme of milk. 



Saccharomyces. A genus of plants embracing the yeasts. 



Saprophytes. Organisms subsisting on dead organic matter. 



Sarcina. Spherical bacteria forming packets of cells. 



Spirillum (plural, spirilla). Curved or bent cylindrical bacteria. 



Spores. The latent or resting stage of certain types of bacteria. 



Sterilization. The use of heat in the neighborhood of 212 F. as a 

 germ destroyer. 



