MUTUAL INFLUENCE OF THE STOCK AND GRAFT. 133 



He tried the same experiment with several other variegated plants, but 

 did not find any of them to transmute as the jessamine did. " Other cases 

 of variegation induced in the jessamine by budding are quoted by Dr. 

 Sturtevant in the above-mentioned article. 



M. T. Masters, in the Gardeners' Chronicle, 1872, page 322, gives 

 several examples of variegated scions communicating their variegated 

 character to the stock. In one case a variegated abutilon was extensively 

 propagated by being grafted on other stocks, and Mr. Masters saw whole 

 series of such plants in which the stock had acquired variegation from 

 the scion. He further remarks that Mr. Van Houtte, a well-known 

 nurseryman of Ghent, had ascertained that if by some accident the graft 

 were separated from the stock the leaves subsequently produced from the 

 latter were wholly green, and even the variegated leaves already produced 

 lost their mottled character. 



In the American Journal of Horticulture for 1871, page 215, mention 

 is made of a green-leaved abutilon growing in the Cambridge botanic 

 garden, which sent out a variegated branch after having been grafted with 

 the variegated Abutilon Thompsoni. The graft was then cut off, but this 

 branch continued to bear variegated leaves. 



A case of the transfer of variegation from stock to graft is given in the 

 American Journal of Horticulture for 1871, page 185. It consists of an 

 account taken from the Gardeners' Magazine, of two green-leaved 

 varieties of abutilon which became variegated when grafted upon the 

 vatiegated Abutilon Thompsoni. 



Two additional cases may be given where variegation, transferred from 

 scion to stock, produced new varieties which remained permanent. The 

 nrst is that of Mr. Brown of England, 1 who mentions a yellow ash, graf- 

 ted on a common ash, which induced the latter to put forth blotched 

 leaves, thus forming a new variety which had been propagated for fifty 

 years as the Bredalbane ash. The next case was presented by M. Lemoine 

 to the Central Horticultural society of France, and reported in The Garden 

 1884, page 200. The variegated Passiflora quadrangular is inarched on 

 both Passiflora Raddiana and Passiflora Imperatrice Eugenie induced 

 in both the latter species, above the point of union, variegated branchlets 

 which were propagated as new varieties. Conversely, a scion of Plassi- 

 flora vitifolia grafted on a stock of the variegated Passiflora 

 quadrangular is produced variegated leaves. 



Lindley mentions" "certain kinds of variegated roses which retain 

 their gay markings when budded, but become plain on their own bottom." 



HARDINESS. 



T. A. Knight states as follows, in his "Horticultural Papers," page 223: 

 " Many gardeners entertain an opinion that the stock communicates a 

 portion of its own power to bear cold without injury to the species or 

 variety of fruit which is grafted upon it, but I have ample reason to 

 believe that this opinion is wholly erroneous and this kind of hardiness 

 in the root alone can never be a quality of any value in a stock, for the 

 branches of every species of tree are much more easily destroyed by frost 

 than its roots." 



A. S. Fuller says in the Horticulturist, volume XXIII, 1868, page 74: 



1 Quoted by Darwin in Animals and Plants under Domestication, Vol. 1, page 



2 Theory of Horticulture, 1852, page 221. 



47S. 



