We have, from Mr. Dreer, of Chestnut Street, Philadelphia, samples of his flower seeds, put up to go by mail, which is a great convenience to distant gardeners, ladies, &o.; they have only to put a dollar in an envelop, direct it, place it in a hole in a post-office window, and, with only three cents' worth of manure (no water), a whole bunch of seeds will come up in a few days, without trouble, and you can water at leisure.

R. K. Bliss & Haven, Springfield, Massachusetts, whose advertisements have attracted much attention in our pages, have also sent us samples (innumerable) in this way, for which they will also accept our thanks. An editor of a Journal likes to see the handywork of his readers, and often has a fellow-feeling with them which may be without any public expression, and yet none the less forcible and agreeable.

Descripton of the Greenhouses and Conservatories at Springbrook. By Thomas Meehan, of Germantown, late gardener thereat: - In numerical order from the mansion-house is -

No. 1. A Greenhouse

A Greenhouse, double pitched, and 38 by 20 feet. It includes a seed-room and potting-room, so that the necessary operations of plant growing can be carried on without exposure to the open air. In this house are collected plants from Kew Holland, Cape of Good Hope, and the more temperate regions of the earth.

No. 2. Conservatory

Conservatory - mainly for Rhododendrons and Azaleas. It is 31 feet 1 inch in length by 24 feet in width.

No. 3. Stove Or Hothouse

Stove or Hothouse - same dimensions as No. 1. It Is kept generally at a temperature of 60° or 70º, to accommodate plants from tropical countries.

The above three houses form one complete range, No. 2 being the central, and considerably elevated above the others. Its roof is supported by truss work, in order to avoid the inconvenience and unslghtliness of columns. The whole range is heated by hot water from two of Burbidge & Healy's boilers, with Sylvester furnaces, furnished by Morris, Tasker & Morris, of this city, which answer admirably.

No. 4. Cactus Rouse

It is 51 feet in length and 33 feet in width, double pitched. The roof; massive as it is, is supported by a single iron column, and four iron braces, running diagonally. It embraces the largest and choicest collection of those grotesque-looking plants in the country. Some of them are of great age, and many reach almost to the apex of the roof. A single specimen of the celebrated "Visnaga," or "Tooth-Pick Cactus," of the globular variety, is over four feet in circumference. These gigantic forms make, as it were, a " body guard" to the apartments of the Queen of Flowers, the Victoria Regia occupying the adjoining house.

No. 5. Lily House

30 feet long and 33 feet wide. In the centre is an octagon-shaped tank, 24 feet in diameter, in which the Victoria is grown. This tank is formed in the central portion, about 14 feet square, being built up of brick, 4½ feet high. From the top of this brick centre a ledge of boards proceeds outwards, about five feet all round, handsomely curbed at its edges, in order to contain enough water to accommodate the floating leaves. The brickwork is coated with hydraulic cement, and boards are fastened vertically to the sides by copper bolts passing through them and the brickwork, and secured by nuts and screws. To these boards brass hooks are affixed, to support the heating pipes hereafter to be described; and the whole interior of the tank, as thus formed, is lined with sheet lead; about 4,000 lbs. being employed for that purpose. The bottom of the tank is composed of stout hornblende stone, supported on pillars of masonry, to allow the four-inch hot-water pipes employed to heat the soil in the bottom of the tank, to pass up and down in every direction beneath.

Connected with these four-inch pipes is a range of one-inch leaden ones, which, passing through the sides of the tank, and supported by the brass hooks above alluded to, heat the water in the inside by the hot water circulating through them. To equalize the heat in the tank, the flow of two of these pipes is led round the tank to the right, and that of the other two to the left. The soil occupies about two feet of the tank's depth, into which the lily is planted, the remainder being filled with water, which is brought into the tank over a planished copper wheel with floats, by propelling which* a current is produced that keeps the surface of the water clean and pure. On the right of the Lily House, as we enter it, is a rectangular tank of the entire length of the house, heated to the same temperature as the Lily tank in the centre, by a small pipe led through it from the larger ones beneath. This is kept for the Nelumbium speciosum, the famous "Lotus' of the ancients; Nymphaea ceruloe and N, rubra, the red and white water lilies of China, and other aquatics.

This tank serves also as a nursery for gold and silver fish, which are reared here in great abundance.

The main plant of the Victoria occupies the centre of the tank. Around it are a number of small ones in boxes, intended by the proprietor for gratuitous distribution amongst those disposed to try the cultivation of the plant in other parts of the country. The writer feels a certain degree of sadness in learning that the old plant of the Victoria, which had contributed to the enjoyment of thousands, as well as received, in by-gone times, so large a share of his own attention and care, has been discarded for one of its own offspring - a "true American".

A fine collection of exotic ferns, for which the moisture, partial shade, and temperature of the house, are so well adapted, lines one of its sides. One end is covered with air plants, growing on blocks of wood, and the other by that unrivalled creeper, the Cissus discolor, the beautiful velvety variegation of the leaves of which will probably never be surpassed. Two varieties of pitcher plants, and an extraordinary specimen of the very scarce and beautiful East Indian plant, Brownea grandiceps, are also inhabitants of this department. On the south side of the house, the light is admitted through stained glass of various colors, producing a highly pleasing effect on the foliage of the ferns, and other desirable plants, within its reach. The Lily House being separated from the Cactus House only by a nine-inch wall, the two are heated somewhat in connection with each other. Two boilers are employed. The one specially intended for the former, is in no way connected with the latter, except that the hot water intended for the wheel (to which a stream of cold water is also led) is heated by a circulation passing through a leaden pipe to a reservoir from which both boilers are filled at the extremity of the Cactus House. The boiler of the Cactus House is larger than the other; and besides the pipes which it heats around " its own" house, has a branch diverging on the other side, and, passing round the Lily House, supplies the latter with additional heat in severe weather.