CONTENTS. 



CHAPTEE VII. 



SUMMARY OF THE HEIGHTS AND WEIGHTS OF THE CROSSED 

 AND SELF-FERTILISED PLANTS. 



Number of species and plants measured Tables given Pre- 

 liminary remarks on the offspring of plants crossed by a fresh 

 stock Thirteen cases specially considered The effects of 

 crossing a self- fertilised plant eithe/ bj another self-fertilised 

 plant or by an intercrossed plant of the old stock Summary 

 of the results Preliminary remarks on the crossed and self- 

 fertilised plants of the same stock The twenty-six exceptional 

 cases considered, in which the crossed plants did not exceed 

 greatly in height the self-fertilised Most of these cases shown 

 not to be real exceptions to the rule that cross-fertilisation is 

 beneficial Summary of results Relative weights of the 

 crossed and self-fertilised plants Page 238-284 



CHAPTER VIII. 



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-fer- 

 tilised 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. 



285-311 



CHAPTER IX. 



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 



