II INTRODUCTION. 



of tho vascular cryptogams are arranged after that of EXGLER and PIUNTL. 

 Of the sp3cies and varieties mentioned iu this volume, forty-five are proposed 

 as new sp3cies and one is regarded as a new variety of a known species. 

 One new genus, Diplocarcx, has been proposed, and one family, Connaracese, 

 and twelve genera are mentioned as new to the flora of Formosa. The latter 

 genera are as follows : Rouren, Gnucalis, Slum, Conioselinum, Bcerlayio- 

 dendron, Amitostigma, Phyttomphax, Eri/throdcs, Tlnixspermum, Ascocentrum, 

 Holcofjlossum, Triclioylottis. Thus, up to the present date, the flora of Formosa 

 represents, so far as is known, 3,658 spades and 79 varieties, belonging to 

 1,197 genera and 170 families. 



The original plan of the work, as above stated, was that it should be 

 completed in fifteen volumes, and I still intend, if circumstances permit, to 

 publish five more volumes, issiuug one each year. The completion of the 

 study of the flora of Formosa, which is the real aim of this work, is some- 

 thing one cannot expect to accomplish even in a much longer time. For the 

 present one can only hope that notluug will happen to interfere with the 

 completion of the work as originally planned. For this all things seem to 

 promise well. On the other hand there is always the possibility of a change 

 in one's parsonal circumstances, and it would be unfortunate if this work in 

 wliich I have been engaged for a score of years should for any reason come 

 to an abrupt end and be left without having been given even a tentative form 

 of completion. Such considerations have led me to think that I should avail 

 myself of the opportunity presented by the publication of Volume X. to give 

 to it something of the formal character of a concluding number of the series. I 

 should then be quite satisfied to think that the work had been formally completed, 

 even should the continuation of the latter part unfortunately be interrupted. 



Accordingly, Volume X. contains a general index to the series, from the 

 first volume to the tenth, and also to the studies winch I published wliile I 

 was preparing this work on Icones. I have also added two papers, namely : 

 " An interpretation of GOETHE'S Blatt in his ' Metamorphose der Pflanzen ', 

 as an Explanation of the Principle of Natural Classification " and " The Natural 

 Classification of Plants, according to the Dynamic System". The latter deals 

 especially with the natural system established upon the principle on wliich, 

 since my return from Tonkin iu 1917, I have been reflecting, and refers 

 generally to the explanation of natural classification to wliich my attention was 



