NOT being aware that a fresh-water aquarium has before been connected with a Wardian Case, I beg to famish you with a sketch of a contrivance combining the two which I have had in operation for some time.

The apparatus consists of four parts, made of flint glass, with a little cobalt to give it a tinge of blue. Contrivances of this, kind are made of various sizes. In the one from which the sketch was taken, the tank which contains the water in which are the aquatic plants, fishes, mollusks, and insects, is about twelve inches in diameter, and about nine inches deep; near the top in the inside is a flange, with a groove, into which runs the condensed water from the bell-glass, which forms the Wardian Case for the ferns, lycopods, etc.; from this groove it descends to the tank below. Into the centre of this vessel I put the glass pedestal. I then cover the bottom with about two and a half inches of fresh, but not very rich, soil, in which I plant my aquatics; I use for this purpose, Valisneria spiralis, Apono-geton distacbyon, Nymphaea odo-rata minor, and N. macrantha. On the soil I put one inch of well-washed flints, or sea gravel, which prevents the insects, er mollusks, from making the water foul.

I then introduce the water through a fine rose, to about four or five inches deep, into which I put gold fish (small), or sticklebacks, or any other small fish, mollucks,Succinea putris, Planorbis corneus, carina-tus, and marginalis, Cyclas rivicola, and- cornea; insects - any species of oolymbetes, hygrotes, hadaticus, gyrinus, and several other aquatic genera; care must be taken not to introduce any of the large carnivorous larva?. I then prepare for introducing the planets proper for a small Wardlan Case. I put the soil into a blue glass dish, with a rim at the bottom to keep it steady on the pedestal; this dish is one and a half inch deep by seven in diameter, the soil is raised in the centre about two inches; in this I plant the tallest ferns or lycopods, and the smaller round the edge of the dish. The ferns I plant are Adiantum capillus veneris, Lastrsea dilatata Schofieldi, a beautiful small Yorkshire variety; Asplenium viride and trichomanes; Asplenium fontanum, etc.; Lycopods Wildenovi, umbrosum, stoloniferam, mutabile, densnm, and lepidophyllura. When planted, I cover the,soil, in imitation of rockwork, with agates and pebbles of any sort.

I then give the whole a good watering before placing the dish on the pedestal; the whole is then covered with the bell-glass. One before me at the present time has been standing in a window eight months; the water has never been changed, or any addition made, except a small quantity once given to the ferns, etc., in the dish. Should the water become green, in the summer, a small piece of gutta percha pipe, with a small rose at the end, will draw off the water, which may be replaced. The bell-glass may likewise be removed, with benefit to the plants, and a sprinkling of water given them. -Henry Buines, York, England, in Gardener's Chronicle.

* In this connection, the action of frost; the flow and elaboration of sap, before and after the foil of the leaves; the inspissation of saccharine and preservative particles, as connected with the exudation of aqueous matter; the absorption and exhalation Of gases, etc., were briefly discussed, and may form the material of a future communication. Meanwhile, this branch of the subject is particularly commended to the attention of the numerous readers and correspondents of the Horticulturist, many of whom are doubtless well qualified to. impart much valuable information derived from recent developments and experiments.

† Differences in latitude, and variety in seasons, will bear very materially upon this point.

Pears removed to house 29th of December, 1855.

§ The boxes are mostly round ones, with close-fitting covers; of the form and dimensions of large cheese-boxes.

║ As regards the Winter Nelis, the fact, as above stated, might mislead some as to the necessity of its being double-worked. Such., I think, is not the Case. It is one of those valuable pears which, in addition to its other good qualities, generally succeeds well, either on pear or on quince, or on both.

Wardian Case And Aquarium Combined 1100122