[1]

Whilst Their full development is supposed to depend on their affinity for, & union with, other partially developed cells in due order of succession. Gemmules which are do not thus become developed may be transmitted during many successive generations, & thus account for we can thus understand the many well-known & remarkable cases of reversion or atavism.

Thus n not only….

[2]

[Copied extract from J. D. Hooker's Presidential Address to the British Association, 1868.]

Mr Darwin suggests an explanation by assuming that each such cell or fragment of a a plant contains myriads of gemmules, each all each all of which he supposed to have been derived (thrown off) from the separate cells of the mother-plant, & that these the gemmules having the power of multiplication & of circulating throughout out all the tissues of which the plant. consists