CONTENTS. 



Page. 



Introduction 7 



Structural significance of dimorphic branches 8 



Similarity of dimorphic branches to alternating generations 10 



Different types of dimorphic branches 12 



Dimorphic branches of the cotton plant 13 



Various forms of fruiting branches 17 



Sterility of intermediate forms of branches 18 



Intermediates between fertile branches and flowers 21 



Relation of dimorphic branches to acclimatization 27 



Relation of branch dimorphism to weevil resistance 29 



Dimorphic branches of the Central American rubber tree 31 



Relation of dimorphic branches to methods of propagation 33 



The pruning of rubber trees 34 



Dimorphic branches of coffee 34 



Propagation of coffee from old wood of upright branches 35 



Relation of branch dimorphism to the pruning of coffee 37 



Dimorphic branches of cacao 38 



Relation of dimorphic branches to habits of growth 40 



Relation of dimorphic branches to the pruning of cacao 41 



Dimorphic branches of the banana plant 43 



Cultural value of two types of offshoots 45 



The planting of resting tubers 46 



Comparisons of different systems and types of branches 48 



Summary of types of branches 53 



Branches of cotton 53 



Branches of Castilla 53 



Branches of coffee 54 



Branches of cacao 54 



Branches of the banana plant 54 



Conclusions 55 



Description of plates 60 



Index 61 



198 



5 



