APPENDIX P 173 



Grumose, clotted. 



Infundibuliform, form of a funnel or inverted cone. 



Iridescent, like mother-of-pearl. The effect of very thin films. 



Lacerate, having the margin cut into irregular segments, as if torn. 



Lobate, border deeply undulate, producing lobes (see Undulate). 



Long, many weeks or months. 



Maximum temperature, temperature above Which growth does not take place. 



Medium, several weeks. 



Membranous, growth thin, coherent, like a membrane. 



Minimum temperature, temperature below which growth does not take place. 



Mycelioid, colonies having the radiately filamentous appearance of mold 

 colonies. 



Napiform, liquefaction with the form of a turnip. 



Nitrogen requirements, the necessary nitrogenous food. This is determined by 

 adding to nitrogen-free media the nitrogen compound to be tested. 



Opalescent, resembling the color of an opal. 



Optimum temperature, temperature at which growth is most rapid. 



Pellicle, in fluid, bacterial growth either forming a continuous or an inter- 

 rupted sheet over the fluid. 



Peptonized, said of curds dissolved by trypsin. 



Persistent, many weeks or months. 



Plumose, a fleecy or feathery growth. 



Pseudozooglceae, clumps of bacteria, not dissolving readily in water, arising 

 from imperfect separation or more or less fusion of the components, but not 

 having the degree of compactness and gelatinization seen in zooglcese. 



Pulvinate, in the form of a cushion, decidedly convex. 



Punctiform, very minute colonies, at the limit of natural vision. 



Raised, growth thick, with abrupt or terraced edges. 



Rapid, developing in twenty-four to forty-eight hours. 



Repand, wrinkled. 



Rhizoid, growth of an irregular-branched, or rootlike character, as in 

 B. mycoides. 



Ring (same as rim), growth at the upper margin of a liquid culture, adhering 

 more or less closely to the glass. 



Saccate, liquefaction the shape of an elongated sack, tubular, cylindrical. 



Scum, floating islands of bacteria ; an interrupted pellicle or bacterial mem- 

 brane. 



Short, applied to time, a few days, a week. 



Slow, requiring five or six days or more for development. 



Sporangia, cells containing endospores. 



Spreading, growth extending much beyond the line of inoculation, that is, 

 several millimeters or more. 



Stratiform, liquefying to the w'alls of the tube at the top and then proceeding 

 downward horizontally. 



Thermal death point, the degree of heat required to kill young fluid cultures 

 of an organism exposed for ten minutes (in thin-walled test tubes of a diameter 

 not exceeding 20 mm.) in the thermal water bath. The water must be kept 

 agitated, so that the temperature shall be uniform during the exposure. 



