392 



MINNESOTA BOTANICAL STUDIES 



amount of rust is licre evident, and this, with one exception, was 

 found in all cases. The difference was often evident when an in- 

 crease of only a fraction of one per cent was involved. 



A fourth battery of wheat plants, consisting of 12 controls and 

 eight rust-infected plants, was run from January 8 to January 20. 



Fig. 6. Graph showing the relative water 

 loss from 12 control and 9 dis- 

 eased rye plants. 



The results were so similar to those of the cases already given that 

 they need not be recorded here. 



Experiments with Rye 



On January 8 a battery consisting of eight control plants and 

 three infected plants of spring rye, the latter inoculated with Pitc- 



