SECT. II. THE PULP. 315 



plants. It constitutes the principal mass of many 

 of the Fungi and Fuci, and of herbaceous plants in 

 general, as may be seen by dividing the frond or 

 stem, either in a longitudinal or transverse direc- 

 tion ; as well as of the seed-lobes and of succulent 

 fruits, of which any one may easily satisfy himself 

 by cutting up a Bean or Apple from the stalk or 

 tree. It is also particularly conspicuous in the leaf 

 and flower, with their foot-stalks when stripped off 

 the epidermis. And even in the stem of woody 

 plants it is not altogether wanting, although it is 

 cognizable only in the bark of the young and ten- 

 der parts, at least as a separate organ, where it con- 

 stitutes a thin layer immediately under the epider- 

 mis, and forms a sort of secondary integument to 

 the plant, known among botanists by the name of 

 the cellular integument. But this integument 

 seems to me to be, like the secondary integument of 

 the Apple, merely an internal layer of the epidermis, 

 or a distinct and separate epidermis in an incipient 

 state rather than a true and proper pulp. In herbs 

 and succulent plants, and in leaves and fruits in 

 general, if it happens to be destroyed or devoured 

 by insects, it is, like the epidermis in the same 

 circumstances, not again regenerated. But in the 

 bark of trees and shrubs it is again regenerated after 

 some exfoliation even when destroyed by accident, 

 without leaving any scar or trace of a solution of 

 continuity.* In the leaves its colour is generally 

 * Seneb. Phys. Veget. vol. i. p. 1?7. 



