Chap. XL GEAFT-IIYBRIDS. 419 



seem improbable that whatever change in the sap or tissues certain 

 soils induce, whether or not called a disease, might spread from the 

 inserted piece of bark to tlie stock. But a change of this kind 

 cannot be considered to be of the nature of a graft-hybrid. 



There is a variety of the hazel with dark-purple leaves, like those 

 of the coi)per-beech : no one has attributed this colour to disease, 

 and it apparently is only an exaggeration of a tint Avhieh may often 

 be seen on the leaves of the common hazel. When tliis variety is 

 grafted on the common hazel/"° it sometimes colours, as has been 

 asserted, the leaves below the graft; although negative evidence is 

 not of much value, I may add that Mr. Elvers, who lias possessed 

 hundreds of such grafted trees, has never seen an instance. 



Gartner'"" quotes two separate accounts of branches of dark and 

 white-fruited vines which had been united in various ways, such 

 as being split longitudinally, and then joined, &c. ; and these 

 branches produced distinct bunches of grapes of the two colours, 

 and other bunches with berries, either striped, or of an intermediate 

 and new tint. Even the leaves in one case were variegated. These 

 facts are the more remarkable because Andrew Knight never suc- 

 ceeded in raising variegated grapes by fertilising wiiite kinds by 

 pollen of dark kinds ; though, as we have seen, he obtained seed- 

 lings with variegated fruits and leaves, by fertilising a white variety 

 by the already variegated dark Aleppo grape. Giirtrer attributes 

 the above-quoted cases merely to Imd- variation; bat it is a strange 

 coincidence that the branches which had been grafted in a peculiar 

 manner should alone thus have varied ; and H. Adorne deTscharner 

 positively asserts that he produced the described result more than 

 once, and could do so at will, by splitting and uniting the branches 

 in the manner described by him. 



I should not have quoted the following case had not the author 

 of 'Des Jacinthes ' '"'' impressed me with the belief not only of his 

 extensive knowledge, but of his truthfulness: he 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 I have myself 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, which makes the case closely analogou.s 

 with that of the blended colours of the grapes on the united vine 

 bi'anches. 



In the case of roses it is supposed that several graft-hybrids have 

 V)een formed, but there is much doubt about these cases, owing to 

 the frequency of ordinary bud-variations. The most trustworthy 

 instance known to me is one, recorded by Mr. Poynter/'"* who 

 assures me in a letter of the entire accuracy of the statement. Bosa 

 'Itvouiensis had been budded some years previously on a white 



"5 Loudon's 'Arboretum,' vul. iv. "" Amsterdam, 1768, p. 124. 



p. 2595. "" 'Gard. Chrou.,' 1850, p. 672, 



"" 'Bastarderzeugung,' s. 619. with/ voodcut. 



2 E 2 



