DA ADHESION. 
induced artificially ; thus, the employment of the root 
as a stock, “ root-grafting,” is now largely practised 

Fia. 24.—Section through two adherent mushrooms, the upper one 
inverted. 
with some plants, as affording a quicker means of 
propagation than by cuttings; and a still more curious 
illustration may be cited in the fact that it has also 
been found possible to graft a scion on the leaf in the 
orange.’ 
Mr. Darwin, in his work on the ‘ Variation of Animals 
and Plants,’ vol. i, p. 395, alludes to the two following 
remarkable cases of fusion:—‘‘ The author of ‘ Des 
Jacinthes’ (Amsterdam, 1768, p. 124) says that bulbs 
of blue and red hyacinths may be cut in two, and 
that they will grow together, and throw up a united 
stem (and this Mr. Darwin has himself seen), with 
flowers of the two colours on the opposite sides. But 
the remarkable point is, that flowers are sometimes 
produced with the two colours blended together.” 
In the second case related by Mr. Trail, about sixty 
blue and white potatoes were cut in halves through 
the eyes or buds, and the halves were then joined, 
_ the other buds being destroyed. Union took place, 
and some of the united tubers produced white, others 
1) Quoted from the ‘ Revue Hortic.’ in ‘Gard. Chron.,’ 1866, p, 386. 
