Magazine of Horticulture, Botany and All Useful Discoveries 5: 446 (December, 1839)
Grafting the Lilac on the Ash.
It is recommended to graft the different species of lilac on the [Fraxinus] Ornus rotundifolia, or flowering ash, in order to retard the appearance of the blooming, and to prolong the season of that beautiful shrub; but whether the lilacs would endure many years on the ash, is very doubtful, since the period of the movement of the sap in the trees is very different: the lilacs expanding their leaves fully a month before the ash trees. (Annales de la Hoc. d'Hort. du Nord, as quoted in Annales d'Hort. de Paris, and translated in Gard. Mag.) [We are of opinion, that the earlier or later period of the flow of the sap, in the stock, would make no material difference in the vigor or health of the scion.—Ed.]

The Farmer's Cabinet 7(8): 260 (March 15, 1843)
Grafting The Lilac On The Ash.—Mr. Scott, of South Carolina, communicates the following to a Southern paper:
This season I grafted the different species of lilac on the common ash, in accordance with some information I received from a friend, (Mr. Wolf, jr.,) while I lived in Paris. I do not recollect to have seen any account of any one having tried the same in this country. We have grafted about three dozen ashes, varying from four feet to ten in height, with the common and Persian lilac; and I am happy to say that the result has exceeded my most sanguine expectations; for we have grown about 25 healthy plants, with branches from one to eighteen inches long, which I hope in an another year, will be covered with bloom. They were grafted in April, after the lilacs had made considerable shoots. I would, therefore advise, that the scions be taken off in January or February, in order to retard their vegetating too soon for the stocks. Would not the pendulous ash form a beautiful object, by having its branches grafted with Persian lilac?—United States Farmer.

Burbidge: Cultivated Plants (1877)
De Candolle, in writing on Olive-worts (see 'Essai Méd.,' p. 204, and Lindl. 'Veg. King.,' p. 616), remarks: "However heterogeneous the Olive-worts may appear as at present limited, it is remarkable that the species will all graft upon each other—a fact which demonstrates the analogy of their juices and their fibres. Thus the Lilac will graft upon the Ash, the Chionanthus, and the Fontanesia; and I have even succeeded in making the Persian Lilac live ten years on Phillyrea latifolia. The Olive will take on the Phillyrea, and even on the Ash; but we cannot graft the Jasmine on any plant of the Olive tribe—a circumstance which confirms the propriety of separating these two orders."

Trans. Mass. Hort. Soc. (1878) p. 99
The habit of the plant is sometimes altered by grafting. Thus Acer eriocarpum, when grafted on the common sycamore [Acer Pseudo-Platanus, L.], attains in Europe double the height which it does when raised from seed. Cerasus Canadensis, which, in a state of nature, is a rambling shrub, assumes the habit of an upright shrub when grafted on the common plum.... The common lilac attains a large size when grafted on the ash; and Tecoma radicans, when grafted on the catalpa, forms a round head with pendent branches, which are almost without tendrils.—Loudon's Horticulturist, ed. 1841, 283.

Gardeners Chronicle 25: 330 (Oct 28, 1899)
Stocks on which to Graft the Lilac.
In recent years many beautiful varieties of Lilac have been raised on the Continent, and to enable nurserymen to increase their stock of plants by grafting, stocks of Syringa vulgaris and Ligustrum vulgare have been employed. An admirable stock for standards is found in the common Ash — Fraxinus excelsior — which, like Syringa, belongs to the order Oleaceae. This stock being a stronger grower than Ligustrum, affords a better stem for standards; moreover, it attains a much greater age, and does not fall a prey to the grubs of the hawk-moth and wood leopard-moth. Budding as well as grafting may be employed. Wiener Illustrirte Garten Zeitung.