



Plate XII. — Ps. fluoresce)!*. Types of gelatin colonies. Figures 1 and 

 2. Strain LIII (two day colony). Figures 3 and 4. Strains LVI 

 ;in<] r. it^o <i -i a- oninnioot Fieui'ae R. P ppri 7. S tr ains XXXIII 

 (two day colony) XXXVI and XXXIII (one day colonies). (See 

 pages 5i;7-5(is. ) X 75. 



