cessful. The grafts grow well for two or three years, after which, they become cankered and mossy, and appear, what I consider them really to be, parts of the bearing branches of old diseased trees." (p.p. 6, 7, and 8).
I shall not follow Mr. Knight into the details of his experiments, which appear to have been most ingenious and minute in their application, and most satisfactory, when viewed in connection with the theory he has established upon them,
"that all plants of this species, however propagated from the same stock, partake in some degree of the same life, and will attend the progress of that life in the habits of its youth, its maturity, and its decay; though they will not be any way affected by any incidental injuries the parent tree may sustain after they are detached from it. The roots, however, and the trunk adjoining them, appear to possess, in all trees, a greater degree of durability than the bearing branches when the old have been destroyed by accident, or even by old age."
Should the affinity between the apple and the vine, not be considered sufficiently close, to warrant the application to the one species, of the principle established respecting the other, the fact may go far to obviate the objection,—that, from observations made on the fructification of a pea,
