320 BACTERIOLOGY 



CLASS IV. WITHOUT ENDOSPORES. FLUORESCENT BACTERIA. 



I. Gelatin liquefied. 



A. Gelatin liquefied slowly. 



27. Ps. Schuylkilliensis (Wright). 



B. Gelatin liquefied quickly. 



1. Milk cbagulated. 



28. Ps. pyocyanea. 



29. Ps. capsulata (Pottien). 



2. Milk not coagulated. 



30. Ps . fluorescens (Flugge) Migula. 

 II, Gelatin not liquefied. 



A. Milk coagulated. 



31. Ps. rugosa (Wright). 



B. Milk not coagulated. 



1. Milk rendered slightly acid, or litmus milk becomes slightly pinkish. 



32. Ps. incognita (Wright). 



33. Ps.foliacea (Wright). 



2. Milk rendered alkaline in reaction. 



a. Gelatin surface colonies thin, flat. 



* Do not grow at body temperatures. 



34. Ps. syncyanea (Ehrenberg) Migula. 

 ** Grow at body temperature. 



■f Gelatin surface colonies become filamentous on their 

 borders. 



35. Ps. striata (Ravenel). 



■ft Gelatin surface colonies sharp, entire. 



36. Ps. ovalis (Ravenel). 



b. Gelatin surface colonies convex. 



37. Ps. convexa (Wright). 



3. Milk reaction not changed. 



a. Reddish granules in the rods. 



38. Ps. erythrospora (Cohn) Migula. 



b. Rods not characterized as before. 



39. Ps. putrida (Flugge) Migula. 



27. Ps. Schuylkilliensis (Wright) 



B. fiuorescens-SckuylHlliensis Wright : I.e., 448. 



Morphology. Bacilli small, short, ends rounded, in pairs and filaments. A 

 polar flagellum. 



