15 



An inspection of this table shows that height, toUal 

 weight and composition are influenced to a greater or less 

 degree by the amount of water transpired, the direction and 

 extent of this influence varying with the species. 



It will be noted that in the first two series the re- 

 sults for the checlcs are, in general, intermediate between 

 those of the dry .and moist, while in the case of peas, 

 wheat and bucKwheat the results are lower than those ob- 

 tained under either of the other two conditions. This is 

 attributed to the fact that the three last series^, named 

 were run later in the season (see table II) when the number 

 of hours of sunshine per day was greater, as was also the 

 number of bright, clear days. The effect of this was to 

 cause a rise of temperature in the bell-jars above that of 

 the air s\irrounding the checlc plants. Since we have an- 

 other factor entering into the problem which exerts a con- 

 siderable influence on growth, the results obtained from 

 the checlcs are not comparable with those obtained under 

 the other conditions, hence they will be omitted from the 

 present discussion. 



rath the exception of the sunflowers the plants 

 appeared to suffer no ill effects from either the dry or 



