BOOK VI. 
MORPHOLOGY. 
529 
what has been said by writers on morphology under two 
heads : in the first, treating of regular metamorphosis, that is 
to say, of that which is connected with the structure of all 
vegetables ; and in the second, of irregular metamorphosis, or 
of that which influences particular plants or parts of plants, 
and which occurs only in occasional instances. 
M M 
