418 HYPERTROPHY. 
so as ultimately to form a portion of the fruit. But 
it is not necessary to give further illustrations of this 
common tendency in some organs to become hyper- 
trophied. As a result of injury from insects or fungi, 
galls and excrescences of various kinds are very 
common, but their consideration les beyond the scope 
of the present work. 
Enlargement of axile organs—All the species of Pe- 
largoniwm, Geranium, Mirabilis, as well as those of 

Fic. 200.— Pelargonium, one branch of which was hypertrophied. 
Caryophyllee and other orders, have tumid nodes as 
a normal occurrence. In the genus Pelargonium this 
swelling is sometimes not confined to,the nodes, but 
