Sandsteii : influence ok gase.s and vafoks upon growth. 59 



bottles containing lOO cc. of water and then placed under the 

 bell jars with the seedlings. The temperature during the ex- 

 periments varied from 21-23° C. A new quantity of chemical 

 was introduced each time after the seedlings were measured, 

 thus keeping the amount of vapors constant throughout the time 

 the experiments were running. Commercial mixtures of nitrous 

 oxide were used in the above series. 



The results are given below in Tables II and III. 



I. 



II. 

 III. 

 IV. 



V. 



Table II. 



.2 cc. of ether in 2000 cc. of air. 



.2 cc. of chloroform in 3000 cc. of air. 



.3 cc. of carbon bisulphide in 3000 cc. of air, 



.5 cc. alcohol in 2000 cc. of air. 



Control. 



a. Plumule. 



b. Root. 



