Or, if in place of applying a mixed manure, such as we have imagined, to these two soils, we were to take simple chemical manures - say phosphate of lime and sulphate of ammonia, we should probably find, that upon the one soil the phosphoric salt was the best manure, whilst upon the other the salt of ammonia would produce the best effect. It is plain, then, that the value of these different elements of manure must depend on the wants of the plant, and on the capabilities of the soil.

The conclusion, therefore, to which M. Paten arrives, namely, that the mineral manures, consisting chiefly of phosphate of lime, and containing little or no organic matter, are of comparatively trifling value, and that they act so slowly as to be of small profit to cultivators, is perhaps rather too sweeping a condemnation. Undoubtedly they will not supply the place of ammonia, but at the same time they are valuable manures, and on certain soils the cost of their use is amply repaid, especially when they are employed in conjunction with animal or am-moniacal manures. In the composition of artificial manures, M. Paten fully admits the value of sulphuric acid as a solvent of phosphate of lime; and he insists strongly on the great practical value of charcoal when associated with rich animal manures.

In concluding his report, M. Paten well observes, that there is one thing wanting which would be a very great aid to the cultivator, and that is, that all artificial manures should be designated by plain and simple names, expressing their real nature, and that their exact chemical composition should be honestly stated, as their purchasers would be no longer deceived by mysterious names, or misled by vexatious uncertainty as to the real value of the manures they buy. On this point there can be no doubt as to the evil, though the remedy may not be quite so clear. Perhaps the beat advice which can be given is this - buy only of respectable dealers, and do not be deceived by ch?.ap manures; if you are tempted by what is termed a bargain, you are pretty says "Denarius." What is to become of the Crystal Palace? asks Mr. Paxton; and the same questions are daily put by thousands of voices, less powerful but not less earnest. As yet no answer has been given, and probably no answer will be given till the public has more generally expressed its own opinion.

Let us then endeavor to point out to those who do us the honor to read our columns in what way this question strikes us.

"Denarius" believes that the building may be applied to various scientific uses, that it may become a great gallery of sculpture, a winter garden filled with fountains, and groves of Orange trees, a gymnasium where science and art may unite in friendly contest, where schools and lectures would naturally arise, and where periodical exhibitions would be held of silk-weaving or cotton-printing, and the manufactures which give their names to the great City Corporations, the Goldsmiths', the Ironmongers', the Mercers', the Dyers', Ac. "If the place," he says, "were recognized as a receptacle for plants and shrubs, it might be expected that in a very short time it would be well furnished with public donations. Proceeding with the development of this idea more in detail, it may be pointed out that the nave and the aisles 48 feet wide, would give a space of 10 acres independently of the galleries, which would give in addition, walks exceeding a mile. The ground floor might be used for plantations and sculpture, the galleries for potted flowers and smaller works of statuary; but care should be taken to consider the promenade as the chief feature, and not to occupy too much space with the collections.

The public would desire to have walks among flowers and plants - not flowers and plants with some walks. This last kind of treatment belongs to Kew and Chiswick, and the Regent's Park. Spaces at the extreme sides of the building might be kept vacant to be applied to various public purposes, such as periodical exhibitions of agricultural produce, colonial raw produce, machinery,perhaps models of objects claiming patent rights, manufactures, and fine arts."

These ideas he, however, as we understand him, only offers as "supplementary to the great object of a winter garden;" ing more, embellished with birds, and flowers, and trees, and sculpture, displayed in a climate temperate at all seasons. Hig ver pbrpbtum would be inscribed above his portals, and the scene within them would be that of a noble "park, decorated with the beauties of nature and art, under a sky-roof, having a climate, warmed and ventilated for the purpose of health alone, furnishing, close to their own firesides, a promenade unequalled in the world, and, for the six winter months, a temperature analogous to that of Southern Italy. Beautiful creeping plants might be planted against the columns, and trailed along the girders, so as to give shade in summer, while the effect they would produce by festooning in every diversity of form over the building, would give the whole a most enchanting and gorgeous finish."

Are these visions capable of being realized? That is the question which it really interests us to answer. The funds and means out of which a reality may arise are subordinate considerations, especially since the building, the main feature in any calculation of cost, may be said to be already paid for.

That all which Mr. Paxton proposes to do may be easily done, no one acquainted with gardening Will doubt; that the climate of Naples or Madeira may be secured to Hyde Park by means of the Crystal Palace, is as certain as the existence of those two countries. All we require in order to accomplish such an end is a heating power, which will exclude frost in winter, and a water power which will exclude drouth in summer. The rest is simple. That the great engineers who put together the vast fabric can water it and heat it, nobody doubts; that plants will thrive in it if heated and watered, we all of us know perfectly well.