292 The Botanical Gazette. [Angus = 
ment of meristematic tissue by one or both memibers of the 
graft, after which the boundary walls meet and unite through 
pressure, somewhat as in the first case. We generally have 
part of the union in any particular case formed by the coher. 
ence of the walls of old cells, and the remainder formed by 
the growth of new cells arising, as in the case of callus, back 
of the cells injured by the knife. i 
Broken walls of the injured cells are thus pushed into line 
forming a brownish fragmentary wall. marking the junction of 
the two parts of the graft. This wall tends to disappear with 
age; the smaller young cells along the junction of the two 
members enlarge rendering the line of demarkation betwee 
the two tissues faint. 
water from one part of a plant to another is — 
woody tissue, parenchyma being unable to do It. 
where successful union was accomplished; while a others 
did not show direct contact of the woody aden plasts 
the same graft always disclosed it. In med ends of OF 
the binding of the graft nearly always broug afting 
tigid woody rings in direct contact. In gt trad 
cotyledonous to dicotyledonous plants, as a the trades 
tomato graft the scattered woody bundles © | 
