As sho\7n In Table Y, of those flowers not 

 entirely enolosed in netting, but '7]ilch were shaded 

 by the netting, 24.7 per cent produced pods and seed. 

 On other plants used in experiments In 1908, 2^.8 per 

 cent of the flowers which were not enclosed or shaded 

 by netting produced pods and seed. According to 

 these results there was no appreciable effect caused 

 by the screen of one single thickness of mosquito net- 

 ting on the development of seed on these plants. 



GomparatiYe M'umber of Pods and Seeds Forming under ?atu- 

 ral Conditions from Flowers which have been tripped 

 and from glowers which have not been tripped. 



The figures given in the preceding tables 

 show that when alfalfa flowers are screened from, the 

 visits of honey-gathering insects, the effect is to 

 greatly reduce the percentage of pods that are formed 

 from the flowers. However, only a portion of the 

 flowers used in the experiments described above, which 

 were left to develop under natural conditions, were 

 visited or tripped by hone^'-gathering insects. 



In order to determine what proportion of the 

 flowers which are actually tripped produce seed, a num- 

 ber of racemes of flowers on different plants were se- 

 lected, in 1908, on which a portion of the flowers had 

 been tripped by natural causes. On the calyxes of 

 those flowers which had been tripped a small quantity 



- 16 - 



