PLANT BACTERIA. VOL. 3. 



PLATE 32. 



Four Petri-dish poured-platcs of Bacterium solattaccarum (Virginia strain), showing the effect of freezing. 



A and H. plates poured before freezing; C and D. corresponding plates inoculated with the same carefully measured amount of (be 

 bouillon culture, but a.'trr frmint. i e., as soon as the culture was thuwed. The plates were incubate:! for some days at 30 C. 

 The large dark colonies are on the surface, the large pale colonies are between the bottom of the dish and the agar. the dot-like growths 

 are colonies buried in the body of the agar. Photographed Feb. jo, 1904. 



