THE EFFECTS OF CROSS-FERTILISATION AND SELF-FERTILISATION ON THE PRODUCTION OF SEEDS

Fertility of plants of crossed and self-fertilised parentage, both lots being fertilised in the same manner. Fertility of the parent-plants when first crossed and self-fertilised, and of their crossed and self-fertilised offspring when again crossed and self-fertilised. Comparison of the fertility of flowers fertilised with their own pollen and with that from other flowers on the same plant. Self-sterile plants. Causes of self-sterility. The appearance of highly self-fertile varieties. Self-fertilisation apparently in some respects beneficial, independently of the assured production of seeds. Relative weights and rates of germination of seeds from crossed and self-fertilised flowers.