NOTE TO THE SECOND EDITION. 



IN this issue some errors have been corrected, and several 

 passages revised. A short acconnt of the discovery, by 

 the Japanese botanists, Hirase and Ikeno, of the occur- 

 rence of spermatozoids in certain Gymnosperms has been 

 inserted, and illustrated by sketches from preparations 

 which these observers generously gave to the author. 

 This great discovery bridges over, in the happiest way, 

 the gap between Flowering and Flowerless Plants 



D. H. SCOTT. 



July 23, 1897. 



258263 



