Being a constant reader of the Horticulturist, I have noticed several articles on the Gen. Hand Plum, and as its origin seems somewhat of a mystery, and as I happen to know all that is known about it, I have taken the liberty of addressing you on the subject.

The tree from which the original graft was obtained, grew on the late Gen. Hand's place, on the Conestoga, about a mile from Lancaster, Pa., and if living, would now be fifty or sixty years old. About thirty years ago, Mr. George Miller procured a graft, and succeeded in raising it. The original tree died shortly after. Mr. E. W. Carpenter, nurseryman, of Lancaster, Pa., procured a specimen of the fruit about 1831, and as it was of an uncommon size, measuring about two and a quarter inches in diameter, I made a drawing of it for him, as I was in the habit of doing as fast as his standards came into bearing. He budded a number of trees, and sent grafts (among the rest,) to his brother, S. Carpenter, of Lancaster, Ohio, and Robt. Sinclair, Baltimore, and thus introduced it to notice. The drawing in the Horticulturist, though correct, is not as large as I have seen the fruit. It is supposed to be a seedling.

I would also bring to your notice another plum, introduced by E. W. Carpenter, viz: the Montgomery Plum. He found the tree, (a very old one,) some twenty years ago, in a dying condition, on the premises of Mr. Montgomery, and procured four grafts, one of which grew. I have never seen the fruit itself, but he describes it as a very large oval purple plum, and of a most delicious flavor, and very prolific. He has had them as large as a hen's egg. The wood and fruit somewhat resemble the German Quetsche, (blue prune,) though the tree is of a more vigorous growth, and more prolific. Dr. Eli Parry of Lancaster, could doubtless procure you some of the fruit next summer. Having obtained a few grafts, I shall test it here. Yours respectfully. C. G. Siewers. Cincinnati, March 5,1851.

[We are obliged to our correspondent for his concise and detailed account of these fruits. Ed.] -------Boiling "Water for Peach-Trees. - It has been thought impossible to recover a tree badly infected with the yellows. If the following experiment on a peach in this condition will prove of any use by saving the trees of others, it is at the service of your readers.

Many of our peach trees perished during the winter of '49. Others bore no fruit the following summer, and were deeply infected with the yellows, and were accordingly cut down and their roots grubbed up. One or two trees, however, in the same condition, were overlooked, and left. A friend, who is a successful fruit culturist, happened to walk into the garden, and observing a tree bad with the yellows, and hearing an intention of cutting it down expressed, cried out, "By no means, by no means, you can save it!" This was about the commencement of autumn. The tree was evidently dying - leaves yellow, stems full of dried withered fruit, and the root very gummy. He immediately caused a basin to be excavated round the trunk, and the gum and worms to be taken out thoroughly with a sharp knife; while this was doing he applied himself to heading in the branches, lopping off from one foot to three, as he thought necessary ,* cutting away all the dead spurs, twigs, and fruit, and pruning out superfluous branches of sound wood. This done, and the litter all carried off, he ordered a copious supply, (2 or 3 gallons) of boiling water poured round the trunk where the excavation was made.

Whether it was the pruning of the limbs, the scraping about the base of the tree, or the boiling water, those wiser in pomology than myself, must decide; certain it is, however, that an influence quite magical was exerted on the peach, for in two or three weeks it put out fresh and abundant foliage, of a deep green, and continued full of verdure till late frost. [Boiling water is a most excellent application in the spring of the year, for diseased and feeble peach trees, and is a certain remedy for the peach worm. We presume from our correspondent's description of the tree in question, that its yellow leaves and sickly habit, were the result of the attacks of the peach-worm - since he says nothing of the small wiry shoots and diminutive leaves that are the infallible symptoms of the yellows. The latter •disease pervades the whole sap of the tree, and after many experiments, we believe it to be incurable. The best thing to be done is to dig up the tree infected with" it, and burn it, root and branch.

Ed]

Insect on the common daily, or China Rose. This rose, a favorite with me, because independently of its beauty, it is easily cultivated, has been a source of disappointment for several successive seasons during the first flowering time of the summer. An insect resembling the bumble bee, (humble bee,) has been the depredator. It is, however, not half so large as the insect named, and of a dark color. Its attacks commence as soon as the buds begin to show the red leaf, and more vigorously as they are near unfolding. They eat around the edges of the petals, and scoop out the forward or half blown roses, in the form of a bowl. They have been killed by slapping the hands quickly together over a bud, before they are aware, thus catching two and three at a time; a continual succession, immediately, however, has supplied the place of those destroyed, and after a time they also become shy, ("biding their time") from the efforts made to kill them. In one season, those destroyed amounted to over three hundred.

"The rose is sweetest when 'us budding new," says Sir Walter Scott, and so thought these vagrant bees; for not a full blown rose, nor even half expanded bud, could be had while the first blooming season lasted, after which time the bees found some other employment, or their race was run for the summer; for they would return no more until the summer of the succeeding year.

I was told the insect was called the Carpenter-bee, and misled by the name, hoped to find its haunts in the wood of some old building or hollow tree, but being disappointed in tracing them home, the roses were given up in despair. Last summer, however, the retreat of the bee was discovered in the claying or plastering of an out-door oven. The bees were found play-ing about numerous small holes they had bored in the sides of the oven, to and from which they had free ingress and egress; and even, in order as it may be presumed, to afford every facility for the infirm and delicate visiting the inner chambers of the habitation without exposure, they had many table-like galleries raised on the surface of the oven, communicating with the holes leading to the interior chambers, and with each other, after the manner of a labyrinth; - these were about the thickness of a finger, and made of finely wrought clay. No time was lost in destroying this populous city. It is only to be regretted that numbers of the inhabitants escaped, and, perhaps, that some forbearance was not exercised toward them for a time, in order that the internal arrangement of their dwellings, the larvae, etc., might have been laid open for inspection, and curious investigation into their habits.

What is the name of this insect? It seems decidedly of the masonic fraternity.

N. B. These bees attacked no other roses, although there is considerable variety in the garden, Yours. J. C. W. Washington Co., Maryland, Jan. 10,1851.