156 DB. MA8TER8 ON A PINK GLOIRE DE DIJON E08E. 
we are quite justified in doing, that this is a mere case of the agency 
of some local circumstances enhancing and heightening the colour, 
we still do not get away from the reversion theory, and we do not 
gain any explanation of the fact that the adjoining plant was un- 
affected. 
So far as we saw there was no change in the kind, but only in 
the degree of colour. The colouring matter of the Eose is a liquid 
contained in certain cells of the petals. Now, in this case, a few 
more of the cells than is customary were filled with colouring 
matter. Perhaps, for we did not examine the flower, as to this point, 
the cells with the coloured juices overlaid one another, and thus 
produced a deeper tint, as we know happens in analogous cases. 
But supposing that this, or indeed any of the suggested explanations, 
be true, what caused the sudden change, and why was the sister plant 
only a few inches off, grown under apparently precisely similar 
circumstances, unaffected ? If we attempt to account for it by some 
individual peculiarity of constitution, by some idiosyncrasy, as a 
medical man would say, we only confess, but do not conceal, our 
ignorance by the use of a technical phrase. Better perhaps to say 
at once we don't know. 
"With reference to Mr. Ingram's case the conditions are different. 
The plant was grafted on the Manetti, a pink-flowered variety. 
Now, there are cases wherein grafting or budding seems to alter 
the character of the scion. For a long time gardeners, as a rule, 
refused to believe in any such reciprocal action of stock and scion, 
but the evidence is becoming too overpowering to allow the matter 
to remain doubtful. It is not necessary, however, to enter into 
this subject here, as the probability that Mr. Ingram's Eose owed 
its peculiarity to grafting or budding is extremely slight.* The 
only explanation then that can be offered in this case is, that it is 
a bud- variation or " sport." As such, as before explained, it may 
be due to a reversion to the character possessed by some of its pro- 
genitors. In order to ascertain this point it is necessary to know 
the parentage and genealogy of Gloire de Dijon Rose, but this we 
have at present failed to obtain. 
Mr. "W. Paul, whose interest in the scientific aspects of Rose- 
taux,'* p. 35, wherein a list of such roses is given. See also Darwin, "Varia- 
tion of Animals and Plants," p. 379 (1868), where numerous references to the 
literature of the subject are given, and an article on "Bud Variation," in 
"Popular Science Review " (1872). 
* For a brief resume of the more important facts relating to " Graft- 
hybridisation," the reader is referred to an article in the ** Popular Science 
Review,' 1871, p. 141. 
