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length of vine several times greater than did the plants on 

 the untreated plots. 



On the inoculated plots large clusters of tubercles were 

 found on the roots of plants, while on the plants grown from 

 untreated seed tubercles were absent. About May 1 hairy 

 vetch was ready to be cut for hay. It was cut May 9, the 



HAIRY VETCH. 

 Four inoculated plants. Four non-inoculated plants. 



growth on only one of the non-inoculated plots being cut, the 

 other being plowed under as part of another experiment. 

 The growth on the two non-inoculated plots was about equal, 

 the plants on both being reddish to brownish and having 

 branches, most of which were only about 6 to 12 inches long. 

 The marked differences between the inoculated and non- 



