[JONES] STUDY OF SOME AZOTOBACTER 55 



Relation to Drought. 



These organisms proved to be fairly resistant to drought, as some 

 were found active on plate cultures twelve months old, that had been 

 dried out for several months, the medium being shrunken, dried, hard 

 and peeling off the dish in horny flakes with colonies on the surface 

 like pieces of dried varnish and not removable from the medium. 

 Smears, made in water on cover slips and then allowed to dry, showed 

 living organisms present in some cases after two months, producing 

 good cultures when dropped into flasks of Ashby's solution. They 

 were found to be alive in considerable numbers in a small Petri dish 

 full of dried soil that had stood in the laboratory in front of a south 

 window for two years. 



Further work with these organisms is intended. 



