(A. D.) According to Dr. Gray, the Washington Elm at Cambridge, Mass. - a tree of no extraordinary size - was some years ago estimated to produce a crop of seven millions of leaves, exposing a surface of about five acres of foliage. If, for neatness' sake, or to obtain leaf-mould, you gather this annual harvest of leaves, you will, in time, take away great quantities of mineral as well as organized matter, by which the soil will be impoverished, unless it is restored by manures.

Moles may be killed easily and safely, thus: Take a quantity of fresh earth worms; put them in a wooden box with a small quantity of carbonate of barytes, in powder; lay in the runs five or six worms, and continue doing so as long as the worms are carried away by the moles.

The Horticulturist, in 1847, did state that Stephanotis floribunda (a native of Madagascar) will answer well as a summer climber in the open border, if protected in the greenhouse in winter. It is difficult, in this climate, to have it so, though occasionally it will succeed. At the South, it would make one of the handsomest vines possible to possess.

Answers To Correspondents #1

A. D. W. is informed that the Philadelphia Pear does not equal the expectations formed regarding it. We have specimens, this season, from the original tree in Roxborough, Pa., and find it quite inferior - we should say, valueless. The German-town Strawberry is a most valuable variety, originated here by Mr. George Young; and Mr. Downing gives it a high character. There has been a great demand for plants, Mr. Young informs us, and he will be prepared in the spring to fill a large number of orders.

The Des Nonnes Pears, from Thorp, Smith, and Hanohett, of Syracuse, are "very good." Whether they are identical with Beurre de Brignais, we are not able at this moment to decide.

(H. B. Weiser, York, Pa.) The grapes sent are very fine Isabellas.

(A. A. Hull, Maryland.) Your questions are not definitely put.

Answers To Correspondents #2

(John Watson, West Farms, New York.) 1. The horse droppings that are used for growing mushrooms ought to be collected from animals that are fed on dry herbage, and they should be kept entirely free from rain or water while in preparation for receiving the spawn. 2. Succession beds may be spawned from the " beds in crop,'1 by taking a portion of the upper bulk (containing the spawn), and spreading a thin layer over the new bed previous to soiling. The same may be done from a worn-out bed that has been kept dry.

Under the stage of a plant-house is too damp for a mushroom bed, unless extreme caution is used against drip. Imported spawn is most commonly worthless, the rhizoma being often killed by the penetration of the smell of bilge water and damp combined.

(T. T.) The Kentucky Coffee-tree, Gymnocladm Canadensis, is usually propagated from seeds, but there is no difficulty in raising it from cuttings of the roots, care being taken, in planting, to keep that end upwards which is naturally so. It is indispensable to every collection - beautiful at all seasons. The flowers of the Judas-tree, Cercis siliquastrum, are sometimes fried in batter as fritters, and the flower buds are pickled in vinegar. The same may be said of the Canada Judas-tree, C. Canadensis, the young branches of which will dye wool of a nankin color.

(G S. W.) For early potatoes, we can recommend the walnut-leaved. They are very superior.

J. Jay Smith, Esq. - Dear Sir: Herewith I send you a specimen of Cuphea eminent, from a plant that has been in bloom since the end of September. It is one of the new plants of 1857) and pre-eminently an acquisition for winter blooming in either the greenhouse or parlor, and will be a perfectly hardy plant for the Southern States. You will observe that the flowers are in profusion, each one and one-half inch long, and all shades of color from yellow to bright red; the plant is full of foliage, and of easy culture in any rich, sandy loam. R. Buist.

[This is certainly a valuable plant. We received it in 1857, from Mr. Thorbum, of Newark, and noticed at the time its beautiful flowers and foliage. - Ed.)

(Henry C. Blight, Illinois). We have no personal knowledge regarding the " Massachusetts White Grape." The proprietors who advertise it would do well, if it is valuable, to send specimens further south.

Po'kepsie must write better verses than he has sent us on the "Hemlock," if he expects to become a poet.

W. H. Reed (Canada West). Tour interesting communication on Grape Mildew will be given in our next. W. C. Strong's article on Wiegelia Middendornana, next month.

J. B. Watertown (Mass.). Loudon's Encyclopedias of Gardening and of Plants, are two separate works. The price of McMahon's Gardening is one dollar and a half. Philadelphia: Lippincott and Co.

(J. S. S.) Steam ploughing has not yet been perfected in England. Our people are waiting till it promises greater usefulness and economy, than has yet been attained. There are four patents, and if they could be combined, it is believed something might be effectively done. Wait-a-bit, is the plan here. It is coming.

(M. H. H.) The scarlet Flag is the Gladiolus Cardinality and we happen to know-may be procured of Mr. Buist, Philadelphia, and no doubt of others.

The New Hop Tree is simply the old one, Ptelia trifoliata.

(S.) Tour plants are, 1, Aphelandra Griesbreohii, and 2, Ipomaea bona nox.

(W.) The Australian Ivy, French Ivy, etc. etc, which has been without a name so long, has flowered lately in this vicinity, belongs to the natural order, Composite, and is a Senecio, but exactly what the books have not told us. It is a rapid grower, bears parlor heat or a little frost, and, with its beautiful ivy leaf, is a very desirable plant.

(College Hill Subscriber.) We shall endeavor to comply with your request.