Botany.] 
NATURAL HISTORY. 
565 
regret that it should have so far exceeded the limits proper 
for its introduction into the present work. In giving an 
account, however, of the genus of plants to which it is 
annexed, I had to describe a structure, of whose nature 
and importance it was necessary I should shew myself 
aware; and circumstances have occurred while I was en- 
gaged in preparing this account, which determined me to 
enter much more fully into the subject than I had originally 
intended. 
