Fig. 1. — I'rotziiz vulgaris. Impression preparation from "swarming islands 1 

 on gelatine ; 20 hours' growth at 20° C. X 3009. (Houston.) 



Fig. 2. — " Sewage Proteus." Microscopic preparation stained by V. Ermen^em' 

 method, showing one flagellum at the end of each rod ; from a 24 hours 

 growth agar culture at 20° C. x 1000. 



