HARRIS AND KUCIIS : OBSERVATIONS ON POLLINATION. 37 



at random from different plants and the number of ovules 

 counted. It was impossible to tell about the number in each 

 pod which were fully and normally developed seeds or which 

 would become such ; consequently this factor is not taken into 

 consideration. The percentage of ovules which fail to develop 

 is, however, small. The number of seeds found to the pod is 

 shown by the following : 



From this it will be seen that the minimum number of seeds 

 found was 8, the maximum, with an average of 13.4. Since 

 the pods were simply gathered at random, there is no certainty 

 of gaining the maximum or minimum number of seeds, but a fair 

 average of the number produced may be expected. September 

 4 three plants were examined to determine something about the 

 range of variation in the number of ovules produced in the pods 

 of a single plant. The results are given as follows : 



Plant 1 varies from 5 to 11. 



Plant 2 varies from 8 to 18. 



Plant 3 varies from 9 to 14. 



Plant 1 had 35 pods, plant 2 had 64, and plant 3 had 27. 



Plant 1 was selected on account of the small number of seeds 

 produced per pod. 



It will be seen from table D that an average of nearly 3.3 

 (lower buds per cluster is produced. These were moderate- 

 sized, healthy plants, producing on the whole probably more 

 than the average number of clusters per plant. On the ten 

 plants, there were produced 342 clusters, which bore 344 seed 

 pods, instead of about 1120, the number of flowers which might 

 be expected, thus giving less than thirty-three per cent, of the 

 buds which produce mature seed pods. 



It will be seen that, while in the observations made on S. 

 rostratum the flowers which failed to produce seed did not reach 

 much over six per cent., in C. chamsecrista it is over sixty per 



