132

(357

(Conclusion)

As for myself I twice fertilised a few flowers on Dianthus caryophyllus in to two ways, in one case the strictly self-fertilised produced a greater (I conclude no make a unfr uniform differn. average of seed; in the other the reverse was the result. I also With Ipomaea purpurea, I obtained 29 capsules from flowers fertilised by pollen from other flower on the same plant & these contained on an average 4.86 seeds per caps.: whereas 26 capsules from flowers fertilised with their own pollen contain yielded as average of only 4.42 seeds; so that the crossed flowers crossed in this manner contained on an average nearly half a seed in excess or as 100 to 91. I here add that As so often happens when capsules contain few seeds, the self-fertilised were heavier than the crossed seeds in the ratio of 100 to 86. (p. 76 used)

Keep for Weight of seeds

As bearing on this subject it may be added that with in almost all those plants curious cases in which plants are sterile with their own pollen, it is necessary to take pollen not merely merely from another flower on the same plant, but from a distinct plant. As is found with Reseda— but it seems not quite with Escholzia— see H Muller's letter