ADVENTITIOUS ROOTS. 



159 



and also in a cabbage where a snail " having 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 ordinary 

 radicles." 



The production of adventitious roots is not limited 

 to the ordinary leaves of the plant, but may be mani- 



PlO. 72. Grerminating 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 Bunium, creticum 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, i. e., small portions of the stem with a bud or 

 buds attached, or in some cases from portions of the 



' Flora,' 1858, pp. 32-42. 



2 ' Joum. Linn. Soc,,' vol. vi ; " Botany," 1862, p. 24. 



