ADVENTITIOUS ROOTS. 159 
and also in a cabbage where a snail “haying gnawed 
a hole into the middle of a leaf at its junction with 
the stem, a fascicle of roots was formed, bursting 
through the tissue lining the cavity, and covered with 
abundant delicate hairs after the fashion of or dinary 
radicles.” 
The production of adventitious roots is not limited 
to the ordinary leaves of the plant, but may be mani- 

Fie. 72.—Germinating plant of mango, showing production of roots 
from one of the cotyledons (from the Kew Museum). 
fested on the cotyledons; thus Irmisch describes cases 
of this kind in the cotyledons of Buniwm creticwm and 
Carum Bulbocastanum.’' I have figured and described an 
analogous case in the cotyledons of the Mango (fig. 72).” 
To this formation of adventitious roots the gardener 
owes the power he has of propagating plants by 
cuttings, 7. e., small portions of the stem with a bud or 
buds attached, or in some cases from portions of the 
1 « Flora,’ 1858, pp. 32-42. 
2 * Journ. Linn. Soc.,’ vol. vi; “ Botany,” 1862, p. 24. 
