Greenhouses have been much the subject of former volumes of the Horticulturist. In vol. 5, pages 110 and 184, as well as elsewhere, our correspondent will find much information. It is a subject of great interest, and particularly the point he alludes to, that of cheap structures for the many. Eight and ten dollars a running foot, is about the lowest price for anything ornamental, but, for three dollars a foot, a house that will answer to protect and grow flowers, may be built. The topic shall be discussed hereafter. At present, we are overwhelmed with matter waiting admission.

(A. G. H., Wisconsin,) will find a description of a "pit" for keeping and blooming winter flowers in our last number. A more simple one also answers well for keeping plants; sink a pit, of any size you want, below the ground entirely, and line it with brick, stone, or planks; treat it just as you do a hotbed, omitting the manure at bottom. Such is the one you inquire about. Nothing could be more simple; but be sure it has a dry bottom.

(Wm. H. Read, Canada West.) John Fiske Allen, of Salem, Mass., authority on the subject, says: "See Hovey's Magazine for Jan. 1855, page 44, for his article on Hybridizing the Grape; turn also to his book on the Grape, pages 149,150,151, 3d edition, and you will find a plan to save the pollen for impregnation - the only practical one, I think; the pollen, if kept in tin or glass, from the air, and in a dry place, will keep good a year." Mr. Allen is about to introduce to the public some of the results of his praiseworthy efforts, but sufficient plants have not yet been grown to offer them the present spring.

(Henry Sheldon.) The Golden Hamburgh Grape is quite new in England, and is sold at a high price. It has not been received in this country yet.

(A. J. Caywood, Modena.) We have no connection, and never had, with any commercial nursery.

(C.) Consult "Parsons on the Rose," and use good manure, plenty of sun, and keep the roots in a soil that will not retain water too long.

(J. D. Ingbrsoll, Ilion.) We are not aware of any gardener who possesses the seedling* grapes you name.

(J. Powell, Dayton, Ohio.) Tour kind notice came too late, and is now out of season.

A Constant Reader and Subscriber, Baltimore, will find the information he wants in the Encyclopaedias.

Answers To Correspondents #1

(H. M., Burlington, N. J.) Set your Azaleas for the summer in a cool, shady place.

Grapes, of the Isabella kind, may be kept till March, by packing them in boxes with alternate layers of ash-wood sawdust, and keeping them from frost. The boxes may be set one on the other, without any other covering. The sawdust of the ash imparts no flavor to the fruit.

(B. W. A., Boston.) The Sew palm house is 362 feet long by 100 feet wide in the centre, and 66 feet high. It is glazed with sheet glass, slightly tinged with green, the tint being given by oxide of copper. This is to counteract the injurious effects on vegetation, arising from the use of white sheet glass. There are 28,000 superficial feet of hot water pipes. A high tower, at the distance of 550 feet, conveys the smoke; to this, flues lead under ground. The coal is brought in on a subterranean railway. In ventilation, and other matters, the building is equally perfect. Would that we had legislators alive to the importance of instructing the people in such matters, but they are all engaged in horrible politics.

Answers To Correspondents #2

Prepared Insects, of the several parts of the United States, are desired by A. Z., for friends abroad. We can recommend a neighbor of our own, who, in his leisure moments after daily toil, collects and prepares with taste and accuracy most of the insects, butterflies, etc., of this part of the country, and who will be most grateful for orders, which he fills at very moderate prices.

Packing Plants (W. H. Alexander) is an art few are masters of, and yet so important that, as our friend Mr. Barry once wrote, "he who cannot pack properly had better have nothing to do with the nursery business;" yet it is a very simple affair. Not merely " three days" but months sometimes elapse before plants reach their destination; and if properly packed, with complete success. A practical friend has promised us a complete essay on the subject for an early number.

Protection to Plants in Winter, by W. E., not inserted, and will be returned if requested.

Answers To Correspondents #3

(Calla.) Some manuscripts were lost out of our wagon on its way to the printer's - -a most unusual occurrence; and, amidst much else that was useful, all our elaborate answers to Caul's numerous questions, and several valued communications, have been deposited in the road. She will have to excuse us, for the questions were lost with the answers, not more to her regret than our own.

Indisposition and absence in search of health, must serve, with ragret, for many apparent neglects of valued correspondents this month.

Wm, Stewart & Sobs, of Quincy, Illinois, have forwarded us a very clever "condensed catalogue of fruit and ornamental trees, etc etc".