vi PREFACE 



series by themselves, and finally come the simple 

 Cyanophyccce. 



The account of the Rhodophycccv is based on the 

 scattered papers of Schmitz (p. 37), who by utilising 

 his own researches and the splendid investigations of 

 Thuret and Bornet has almost wholly altered the 

 classification of this sub-class. A mere outline of his 

 results has been published with the effect of destroy- 

 ing the earlier classification and of incompletely 

 establishing his own. The full justification of his 

 system will, however, be published soon, having been 

 left by him almost finished at his lamented early 

 death. I have thought it better to give here from 

 the fragments of his work accessible to me, and from 

 other sources, an account of the sub-class under his 

 system, rather than revert to the old classification. 



I have to thank the Council of the Linnean 

 Society, the editors of the Annals of Botany and 

 Journal of Botany, and Messrs. Dulau and Co., 

 publishers of the Phycological Memoirs, for their 

 kindly granted permission to reproduce copies of my 

 own and other figures. I am also indebted to 

 M. Bornet, Prof. Reinke, Graf zu Solms-Laubach, 

 Dr. John Murray, Mr. Edward Trewendt of Breslau, 

 Dr. Hauptfleisch, Dr. Kuckuck, Mr. Richards, 



