CONTENTS. 



PAGE 



Prefatory Lettee, ..... v 



Editok's Preface, . . . . . . vii 



CHAP. 



I. Introductory Hemarks, .... 1 



II. Advantages which accrue to the Plant from bearing 

 Flowers, and especially from certain Conformations 

 of Parts of the Flower, .... 5 



IIL Disadvantageous Influences and Attacks to which 



Flowers are exposed during Blossoming, . . 14 



IV. Means of Protection against those Injurious Influences 

 and Attacks by which the Advantages which accrue 

 to the Plant from bearing Flowers might be lost, . 27 



A. Protective Appliances of the Leaves, in which are 



formed the Materials for the Flowers, . . 28 



B. Protective Appliances of the Flowers against Un- 



bidden Guests, . . . . .32 



1. Protection from certain Animals by the Secretion 



in the Flowers of Distasteful Substances, . 35 



2. Access to the Flowers Impeded by their Isolation 



in Water, . . . . .39 



3. Access to Flowers impeded by Viscid Secretions, . 49 



4. Access to Flowers impeded by Prickles, . .69 



5. Access to Flowers impeded by Hairy Formations, 79 



