128 REPORT OF COMMITTEE 



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



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 in form of a turnip. 



Opalescent, resembling the color of an opal. 



Optimum temperature, temperature at which growth is most rapid. 



Papillate, growth beset with small nipple-like processes. 



Pellicle, bacterial growth forming either a continuous or an interrupted sheet 



over the culture fluid. 

 Peptonization, rendering curdled milk soluble by the action of trypsin. 

 Peritrichiate, covered with flagella over the entire surface. 

 Persistent, lasting many weeks or months. 

 Plumose, a fleecy or feathery growth. 

 Polar, at the end or pole of the bacterial cell. 

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



Punctiform, very small, but visible to naked eye; under 1 mm. in diameter. 

 Radiate, showing ray-structure. 



Raised, growth thick, with abrupt or terraced edges. 



Reduction, removing oxygen from a chemical compound. Refers to the con- 

 version of nitrate to nitrite, ammonia, or free nitrogen, and to the decol- 



orization of litmus. 

 Rhizoid, growth of an irregular branched or root-like character, as in B. mycoides. 

 Ring, growth at the upper margin of a liquid culture, adhering to the glass. 

 Rapid, developing in 24 to 48 hours. 

 Rugose, wrinkled. 



Saccate, liquefaction in form of an elongated sac, tubular, cylindrical. 

 Slow, requiring 5 or 6 days for development. 

 Spindled, larger at the middle than at the ends. Applied to sporangia, refers 



to the forms frequently called Clostridia. 

 Sporangia, cells containing endospores. 

 Spreading, growth extending much beyond the line of inoculation, i.e., several 



millimeters or more. 

 Stratiform, liquefying to the walls of the tube at the top and then proceeding 



downwards horizontally. 

 Transient, lasting a few days. 

 Truncate, ends abrupt, square. 



Turbid, cloudy with flocculent particles; i.e., cloudy plus flocculence. 

 Umbonate, having a button-like, raised center. 

 Undulate, border wavy, with shallow sinuses. 

 Viscid, growth follows the needle when touched and withdrawn; sediment on 



shaking rises as a coherent swirl. 



