INTERRUPTION. 327 
Darwin, speaking of the tendrils of Bignonia 
capreolata, says it is a highly remarkable fact that a 
leaf should be metamorphosed into a branched organ, 
which turns from the light, and which can, by its ex- 
tremities, either crawl like a root into crevices, or 
seize hold of minute projecting points, these extremities 
subsequently forming cellular masses, which envelope 
by their growth the first fibres and secrete an adhesive 
cement. 
Interrupted growth—This term is here used in the 
same sense as in ordinary descriptive botany, as when 
an ‘‘interruptedly pinnate’ leaf is spoken of. A similar 
alternation may be observed occasionally as a terato- 
logical occurrence, though it is not easy to account 
for it. 
Fig. 175 shows an instance of the kind in a radish, 

Fic. 175.—Interrupted growth Fie. 176.—Interrupted growth 
of Radish (from the ‘ American in Apple. 
Agriculturist.’) 
and fig. 176 a similar deformity in the case of an 
apple, the dilatation of the flower-stalk below the 
ordinary fruit producing an appearance as if there were 
two fruits one above another. 
In leaves this peculiar irregularity of development 
is more common. 
