IV carer: effects of rusts ui-on tkaxsitratjox 



389 



In figure 2 an analysis of the combined results shown in figure 1 

 is given. Here the variations of the plant groups of the different 

 containers may be seen. It may be noted that the rusted plants giv- 

 ing the greatest variation from the controls at the beginning, like- 

 wise give the greatest variation in general throughout. The per 

 cent of pustular area of each plant group is designated on the chart. 



mmm 



■rF- 



--■■\ 



-^ 



- 1- 



# 





4^ 





Fig. 3. Graphs showing the relative transpiration between 12 healthy and 16 rusted 

 wheat plants. The broken l!ne is the evaporation graph. 



A relationship may be seen between the amount of rust and the 

 transpiration rate, although this is more clearly shown in other 

 cases. 



A second battery of wheat consisting of nine similarly rusted 

 plants in three containers, and six healthy plants in two containers 

 was carried on at the same time as the preceding and under exactly 

 the same conditions. Since average results from a large number of 



