This section is from the book "The Gardener's Monthly And Horticulturist V18", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
Some thirty years ago there stood in my uncle's orchard in Stafford, Conn., a small apple tree which bore fruit, one side of which was sweet and the other side sour. I was told that this result was brought about by inoculating a young tree with a half of two buds taken respectively from sweet and sour apple trees, and firmly joined together before the inoculation. I do not know what the varieties were that were joined together for the inoculation, but the hybrid product was of no account except as a curiosity. Indeed, so far as I remember, the fruit was apt to be imperfect in form, and not always possessing the characteristic of "one side sweet and the other side sour." A few years since I visited the place, hoping to procure a specimen apple for a scientific friend, but found that the tree had gone to decay. I have, therefore, to rely upon the impressions of my boyhood, and do not know that I could substantiate these statements by any one now living. Still I have very distinct recollections of frequently experimenting with the fruit, principally, I must confess, to see whether it was good for anything at all to eat, and feel sure that my general impressions regarding its characteristics are correct.
[Because an apple is part sour and part sweet, is no evidence that it was produced by grafted buds. It is known that the Rhode Island Greening will be sometimes sweet, and sometimes sour. We know now that buds can be united, and the result is the blending of characters, forming a new individual kind - a true hybrid - but the experiments so far made do not favor the idea, that two distinct characters can be made to run along separately in one tree, so that the flowers, fruit, and so on, on some branches shall be of one sort, and on other branches of another. We know of no experiments which prove anything like this. - Ed. G. M.]