i8o 



Nitrogen Fixation by Yeasts 



TABLE III. 



water media as in the tap water media, they are in many cases 

 definite enough to remove any doubt that these organisms are 

 possessed of the power of fixing atmospheric nitrogen, even if 

 amounts below 0.3 mg. nitrogen are to be attributed to experi- 

 mental error which indeed the writer very seriously doubts. 

 There were slight losses of nitrogen from some of the culture solu- 

 tions which can hardly be explained in any other way than by 

 attributing them to experimental error. It is very striking that 

 organisms which in their natural habitats are accustomed to draw- 

 ing their nitrogen supply from a plentiful store of that element 



