Chap. VII. POLYGAMOUS PLANTS. 291 



1865 "innumerable very fine fruits." I may add, 

 that three other female trees growing close by were 

 observed, but only during 1863, and they then bore 

 abundantly. With respect to the poUeniferous bushes, 

 the one marked C did not bear a single fruit during 

 the years 1863 and 1864, but during 1865 it produced 

 no less than 92 fruit, which, however, were very poor. 

 I selected one of the finest branches with 15 fruit, and 

 these contained 20 seeds, or on an average 1 • 33 per 

 fruit. I then took by hazard 15 fruit from an adjoin- 

 ing female bush, and these contained 43 seeds ; that 

 is, more than twice as many, or on an average 2 • 86 

 per fruit. Many of the fruits from the female bushes 

 included four seeds, and only one had a single seed ; 

 whereas not one fruit from the poUeniferous bushes 

 contained four seeds. Moreover when the two lots of 

 seeds were compared, it was manifest that those from 

 the female bushes were the larger. The second 

 poUeniferous bush, D, bore in 1863 about two dozen 

 fruit, — in 1864 only 3 very poor fruit, each containing 

 a single seed, — and in 1865, 20 equaUy poor fruit. 

 Lastly, the three poUeniferous bushes, E, F, and G, 

 did not produce a single fruit during the three years 

 1863, 1864, and 1865. 



We thus see that the female bushes differ somewhat 

 in their degree of fertility, and the poUeniferous ones 

 in the most marked manner. We have a perfect 

 gradation from the female bush, B, which in 1865 was 

 covered with " innumerable fruits," — through the 

 female A, which produced during the same year 97, — 

 through the poUeniferous bush 0, which produced 

 this year 92 fruits, these, however, containing a very 

 low average niunber of seeds of smaU size, — through 

 the bush D, which produced only 20 poor fruit, — ^to 

 the three bushes, E, F, and G, which did not this 



