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 lies beyond the scope 

 of the present work. 



Enlargement of axile organs. All the species of Pe- 

 largonimn, Gerankmii Mirabilis, as well as those of 



yfP^ 



Pio. 200. Pelargonitmi, one bi*anch of which was hypei-trophied. 



Caryophyllew and other orders, have tumid nodes as 

 a normal occurrence. In the genus Pelargoiimm this 

 swelling is sometimes not confined to the nodes, but 



