36 



TRANSACTIONS AND PROCEEDINGS OF THE [Sess. lxi. 



with clover, robinia, or lupin, soon began to show nitrogen 

 hunger, shedding their leaves. The non-inoculated plants 

 were ultimately quite leafless. 



EXPERIMENT III. 



contains additional interest. The plants experimented 

 with this time were red clover, five in each pot, and all 

 the conditions of the other experiments the same. 



In this experiment the inoculations with pea bacteria, 

 with robinia bacteria, and with lupin bacteria showed in 

 the first two no effect whatever, and with the lupin only 

 a very limited effect. 



Comparing the pea inoculation with the clover inocula- 

 tion — 



As to flowers and fruit. (3n cutting in October, the five 

 clover plants inoculated with clover bacteria had had 54 

 flower-heads, while the pot with clover plants inoculated 

 with pea had only 8 flower-heads. 



EXPERIMENT IV. 

 will have an interest for foresters. Eobinia plants were 

 inoculated, some with pea bacteria and some with robinia 

 bacteria. The robinias inoculated with robinia bacteria 

 greatly excelled the robinias inoculated with pea bacteria. 



