Sandsten: influence of gases and vapors upon growth. 57 



Table I. 



(KEY.) 



I. 1/32000 parts of NOH^ 



II. 1/2S000 " " '' 



III. 1/24000 " " " 



IV. 1/20000 " " " 



(a) Phaseohis multijlorus. 



(b) Vicla faba. 



(c) Control of Phaseolus. 



(d) Control of Vicia. 



It will be seen that very small quantities of ammonia vapors are 

 not fatal to the germination. In none of the experiments had 

 any of the seeds germinated during the nine days they were 

 under the bell jars, nor had any of the seeds in the control ger- 

 minated. The odor of ammonia from the seeds treated could 

 readily be detected. It was noticed throughout the experiments 

 that the plants from the treated seeds had a deeper green color 

 than the control. This was especially noticeable in the case of 

 a and b in series I and II. Nor did it appear that the ammonia 

 vapor had any subsequent bad effect on the plants ; on the con- 



* One plant only. 



