50 



MAINE STATE COLLEGE 



was given an excess of pollen, the stigma being well smeared. 

 The effect on the form and size of the fruit was very marked. 

 The fruit receiving the large amount of pollen was of normal size 

 and nearly symmetrical in form, while the other was small and 

 deformed. The larger fruit produced an abundance of seeds 

 and all of the cells were well developed ; the smaller developed 

 seeds on one side only, while the other side was nearly solid. 



Fig. 11. Dijffereut Amounts of Pollen. 



During the past winter the experiments have been repeated 

 many times and the results have been uniformly similar to those 

 detailed. In the first case, — see Figures 10 and 11 — the flower 

 nearest the base of the cluster received an excess of pollen, while 

 the other received a very small quantity on one side of the stigma. 

 In another instance — Figures 12 and 13 — the flower at the base 

 received the small amount of pollen, while the other was given an 

 excess. Similar results were obtained, indicating that the rela- 

 tive position of the flower has no influence in determining this 

 point. As will be seen from Figure 13, the seeds in this instance 

 — but ten in number — were all born in one cell, and the de- 

 fornaity of the fruit was correspondingly greater than in other 

 cases. The difference in size of the fruits was even greater in 

 some instances than in those already cited. 



The exact number of pollen-grains necessary to insure partial 

 development of the ovary, in case of tomato, I am unable to state 

 at the present time. Certain it is, however, that the secondary 

 action of the pollen in stimulating the growth of the fruit is of no 

 small importance. No doubt the greater development of the one 



