SUPPLEMENT. Success of feveral Experiments, fince the Publication of 66 SINCE I published my "Obfervations on the Diseases, De fects, and Injuries in Fruit and Forest trees," I have been assiduous in making experiments for the fake of improvement. A great many hollow trees that had, when I took them in hand, little more than the bark remaining found, have within these few years been entirely filled up: others, that were headed down within a few feet of the ground, have their stumps now completely covered by the leading shoot, forming handsome trees; and the places where they were headed are only discerned by a faint cicatrix. Of a great many, I fhall only particularize a few inftances. A Lime-tree, about eighteen inches in diameter, whose trunk was decayed and hollow from top to bottom, to which, after cutting out the decayed wood, I had applied the Compofition about fixteen years ago, was cut down last year on purpose to examine the progress it had made in the interior part, and was found entirely filled up with new found wood, which had completely incorporated with what little old wood remained when I first took it in hand. The body of this tree I had cut in short lengths, which I have now in my poffeffion, U U to to fhew to any gentleman who wishes to be convinced of the fact. An old Elm whose infide was totally decayed, and out of which, at different times, were taken two large cart loads of rotten wood, has made shoots upwards of twenty feet high in the course of fix years. Another Elm, on the Palace green, which was headed about twenty feet from the ground, has produced a shoot forty-fix feet high, and five feet nine inches in circumference. A Lime, cut down near the ground, has now a shoot twenty feet high which entirely covers the stump, forming a fine tree twenty-one inches in circumference. A Sycamore treated in the fame manner is now thirty feet high, and twenty-fix inches in circumference. Another is thirty feet high, and two feet in circumference. These are now fine thriving trees, and the cicatrices hardly difcernible. A Horse-Chefnut headed down has produced, from its hollow stump, four fine fhoots, one of which is cut down; the other three are upwards of thirty feet high, and one of them is twenty-fix inches in circumference. Two of the remaining three are to be cut down, leaving only one to form the body of the tree. A Lime, whofe hollow part is eleven. feet high, is alfo filling up; the tree is a foot in diameter. A decayed part, four feet high and twenty-eight inches broad, in a large Elm, is now filling up rapidly with found wood. About two feet and a half in length on one fide, which was for fome time left to nature, ftill continued to decay till the Compofition was applied: new wood and bark are now forming. An Elm, at the back of the old fruit-room, near the garden wall, which was entirely hollow, was also headed down: the new head now fpreads about twenty-four feet, and is eighteen feet high. Another large hollow Elm near the last was headed down; it afterwards produced a shoot fixty fixty feet high, and three feet and a half in circumference : the hollow was upwards of two feet in diameter. There are a great many other Elms, fome of which had wounds ten feet long and two feet broad, now entirely filled up; besides many Sycamores, Oaks, and other forest trees, all restored to a flourishing state, by having the dead wood cut out and the Compofition applied. An Oak that was headed down about fix years ago is reprefented in PLAte XII. In hollow trees, the rotten and decayed wood must be cut out at different times, as the new wood comes in contact with it; but great care must be taken not to cut out too much at once, but to leave enough to fupport the tree and prevent it from being blown down by high winds, till the new is ftrong enough for that purpose: the remainder may then be cut out. A number of inftances of the fuccefs attending my method of pruning and training might be adduced; but I shall notice only the following. Mr. Aberdeen, gardener to John Sullivan, efq. at Richings near Windfor, has followed it for fome time with great fuccefs both in the house and on the natural wall. Having heard for several years of the very fine and large crops that were produced in the forcing-houses belonging to John Julius Angerstein, efq. at Woodland-Houfe, on Blackheath, I was induced to take a journey thither, in company with John Wedgwood, efq. to see what method was pursued to obtain fuch crops. On enquiry, Mr. Stuart, the gardener, candidly told me, that several years ago he had been at Kenfington Gardens, where he faw my method of pruning and training, was convinced of its advantages above the old, and had adopted it with great fuccefs. Indeed, there were, at the time UU 2 time I was there, the finest and largest crops of Grapes that I had ever seen in any forcing houses. Two houses, in particular, were covered from top to bottom with fine Grapes, and the Vines trained in the ferpentine manner. John Wedgwood, efq. of Cote House near Bristol, a gentleman who is much attached to gardening and planting, tells me, that he has practised my mode of pruning and training fruit-trecs, particularly Peaches and Nectarines, in his houses; and that he is highly pleased with the method, which has been attended with great fuccefs. Lord Frederick Campbell has lately favoured me with a lift of eighty-five fruit-trees, of different kinds, that were headed down, in his gardens at Coomb-bank in Kent, in the years 1798 and 1799; and afterwards trained and pruned according to my method: many of them, before heading down, were in a very cankery, unfruitful state, and overgrown with mofs; thefe are now in a fruitful, healthy, and flourishing condition: fome of the Efpaliers have made shoots from two to three yards long, and upwards. These trees were cut and prepared by Mr. Williams, who had been for fome time accustomed to my way of treating fuch trees, and whom I recommended to his Lordship as a gardener. These trees are very proper patterns for any gentlemen in the neighbourhood, who wish to give the Compofition, and method of training and pruning, recommended in this Treatife, a fair trial. Several fuccefsful trials have alfo been made at the Duke of Dorfet's Seat, at Knowle in Kent, at Hatfield House, the feat of the Marquis of Salisbury, and at a great many other places; and Experiments are now making at Sir Henry Strachey's, at Rook's Neft, near Godstone, in Surrey. ALTHOUGH ALTHOUGH I do not mean to enter at large on the culture and management of forest-trees; yet as the following obfervations on raising Oaks, and directions for planting Chefnuts for underwood, may be of confiderable fervice, I shall, without any farther apology, lay them before my readers. The best Way of raifing Oaks. It is a generally received opinion, that when an oak lofes its tap-root in transplanting, it never produces another; but this I have proved to be a mistake, by an experiment which I made on a bed of oak plants in the year 1789. I transplanted them into a fresh bed in the forementioned year, cutting the tap-roots near to fome of the fmall fide-roots or fibres fhooting from them. In the fecond year after, I headed one half of the plants down, as directed for Chefnuts, and left the other half to nature. In the first season, thofe headed down made shoots fix feet long and upwards, and completely covered the tops of the old ftems, leaving only a faint cicatrix, and had produced new tap-roots upwards of two feet and a half long. One of these trees I left at the Land Revenue Office, for the inspection of the Commiffioners, and to fhew the advantage of transplanting and heading down young oaks, when done in a proper manner. By this mode of treatment they grow more in one year than in fix when raised in the common way. The other half of the plants, that were not headed down, are not one fourth the fize of the others. One of the former is now eighteen feet high, and, at fix inches from the ground, measures fifteen inches in circumference; at three feet from the |