1920] 



SNOW— DIA PHRA GMS 



309 



Experiment 2 



This experiment extended February 14-28. It was set up in 

 the same apparatus as was experiment 1 ; the pressure, however, 

 started at 35 mm. and varied between 20 and 40 mm. of mercury. 

 Cy perns would not grow at this pressure; consequently the results 



Fig. 3.— Growth curves: solid line, no. 2; dotted line, no. 3; broken line, no. 4; 

 curves 2 and 3 cease when culms reached top of jar. 



Scirp 



The quantity of air passing through the 



> was measured and found to be about 1500-2 100 

 times it exceeded this amount, but the flow was ke 



stant. 



xperimental culms were nos. 3 and 4, and the 



and 



EX dve the 



