DIFFERENCE BETWEEN CROSSED AND SELF-FERTILISED PLANTS IN CONSTITUTIONAL VIGOUR AND IN OTHER RESPECTS

Greater constitutional vigour of crossed plants. The effects of great crowding. Competition with other kinds of plants. Self-fertilised plants more liable to premature death. Crossed plants generally flower before the self-fertilised. Negative effects of intercrossing flowers on the same plant. Cases described. Transmission of the good effects of a cross to later generations. Effects of crossing plants of closely related parentage. Uniform colour of the flowers on plants self-fertilised during several generations and cultivated under similar conditions.