VI PltEFACE TO THE SECOND EDITION. 



appended, in chronological order, the titles of all the 

 papers and books on the fertilisation of the Orchidefe 

 which have been published since the appearance of 

 the first edition of the present book. Finally, I will 

 remark that any reader who wishes merely to see how 

 wonderfully complex and perfect are the adaptations 

 for the fertilisation of these plants had better read 

 Chapter VII. on the Catasetidse. The account of 

 their structure and of the action of the several parts 

 will, I think, be intelligible, if he will first glance at 

 the explanation of the terms given at the close of 

 the Introduction. 



