VJ\RIATIOIT lU THE PERCENTAGE OP FLOWERS 

 PRODU CI^IG PODS, AJTP MJICBER 07 SEEDS PER POD. OIT 

 DIPEERENT PLANTS. 



In carrying out the experiments conducted at Pullman 

 and Chinook, it was observed that there was usually a 

 considerahle variation in the percentage of flowers pro- 

 ducing pods, and in the numher of seeds per pod, on differ- 

 ent plants which had received like treatment. This varia- 

 tion is shown in T^ihle XVlll, which gives the results of 

 an experiment conducted at Pullman in 1908. The first 

 position of the tahle gives the percentage of flowers 

 producing pods, and the num.her of seeds per pod, produced 

 "by flowers which developed under natural conditions on 

 seven different plants. The variation in the percentage 

 of flowers producing pods is partially due,- no doutt , to 

 different numbers of flowers becoming tripped by insects 

 on the different plants. 



The second portion of the table shows the percentage 

 of pods, and the number of seeds per pod, produced by 

 flowers from which insects had been excluded. The pods 

 and seeds which developed apparently developed from self- 

 tripped flowers. 



The third portion of the table shows the variation in 



the percentage of flowers which produced pods, and the 



number of seeds per pod, which developed on the same seven 

 plants, from flowers which were artificially tripped. 



(51) 



