This section is from "The Horticulturist, And Journal Of Rural Art And Rural Taste", by P. Barry, A. J. Downing, J. Jay Smith, Peter B. Mead, F. W. Woodward, Henry T. Williams. Also available from Amazon: Horticulturist and Journal of Rural Art and Rural Taste.
Mention is made by Pliny, of a tree in the garden of Lucullus, at Tivoli, which is described in his Natural History. On the trunk of one tree he saw branches which produced pears, others figs, apples, plains, olives, almonds, grapes, etc.; but he adds, that this wonderful tree did not live long. Even at the present day, the gardeners of Italy, especially of Genoa, Florence, and Rome, sell plants of jasmines, roses, honeysuckles, etc, all growing together from a stock of orange, or myrtle, or pomegranate, on which they say they are grafted. But this is a deception, the fact being that .the stock has its centre bored out, so as to be made into a hollow cylinder, through which the stems of jasmines and other flexible plants are easily made to pass, their roots intermingling with those of the stock. After growing for a time, the horizontal distension of the stems forces them together, and they assume all the appearance of being united. M. Thouin, who calls this "The Impostor's Graft" (Greffe des Charlatans), tells us that he himself tried the operation with perfect success upon both a linden and an ash tree a foot in diameter. He contrived to give both of them heads of plums, hazels, wild and cultivated services, walnuts, peaches, and vines, the branches of which were thoroughly interlaced.
Of one of these he gives a figure, which is here reproduced, and which perfectly illustrates the system.