PREFACE. Vll 



laboratory instructions for studying the different types 

 selected. Dr. Vines Las very kindly supplied the 

 chapters on methods and on the morphology of the 

 cells. But besides this he has at every step given the 

 assistance of his own extensive experience in practical 

 teaching. 



It had been our intention to preface the directions 

 for the study of each type with a short account, in 

 language fairly intelligible to the general reader, of its 

 salient morphological facts. This would have repre- 

 sented the brief lecture with which the work of each 

 day began in the course as originally organised. To 

 carry out this intention would have postponed the 

 publication of the teaching directions already prepared 

 by Mr. Bower, and, in justice to him, it has seemed the 

 best course to issue what is already finished without 

 delay. It is intended to follow the present part with 

 another, which will comprise the remaining types of the 

 vegetable kingdom. Should the book be found as 

 useful to students as it is hoped may be the case, I 

 look forward to seeing the original scheme upon which 

 it was planned still carried out in a future edition. 



W. T. THISELTON DYER. 



ROYAL GARDENS, KEW, 

 December 1884. 



