238 INTRODUCTION. [part ii. 



like the bulbous plants, and Orchidacese ; and 

 the Glumaceous plants, or those with scales or 

 glumes instead of petals, as in the sedges and the 

 grasses. The Acotyledones are divided into those 

 with leaves, as the ferns; and those without 

 leaves, as the mosses, lichens, and fungi. 



I have only to add that each subclass is 

 divided into numerous orders, which are dif- 

 ferently arranged by different botanists; the 

 object being to place those nearest together 

 which are most alike. As no one of these 

 arrangements appears to be decidedly better 

 than the others, I have adopted that given in 

 Mr. Loudon's Hortus Britannicus ; marking, 

 where, they occur, the new orders which have 

 been formed, and the alterations in the old 

 ones that have been made since that work was 

 written. 



