According to the author of 'Lothair,' a garden should not look like mosaic work, but mosaic work should look like a garden - a proposition which I leave your readers to make what they like of; but the above class of plants, it would appear, are likely to inaugurate a mosaic style of bedding more perfect and complete than anything that has been attempted as yet in that way. Those who saw the very effective bed of succulents, planted by Messrs Veitch, at the Nottingham Show, will be able to form some idea of their adaptability in this respect. It would not be wise to encourage too much of this style, but, in conjunction with the use of succulents and Alpine plants in a legitimate way, no one can fail to appreciate their effectiveness for pattern-work in certain combinations; and for those who contemplate trying their hand with them, I wish to draw attention to one or two species which another summer's experience enables me to speak of more confidently. One of the best and cheapest I find to be Sempervirum tectorum, the common house Leek. When planted in good soil, I find it to alter in character somewhat, compared to its usual appearance as seen in clumps upon house-tops. The plants get large, and the leaves at the points assume a deep crimson tinge, which renders it exceedingly effective in conjunction with Echeveria secunda glauca and suchlike kinds.

S. californicum is now too well and favourably known to need comment.

S. canariense, noticed in the 'Gardener' some time ago, deserves all that can be said in its favour; it is, perhaps, the grandest of its class, and a free grower. Among the least, but one of the neatest and most effective, is S. hirtuiu, dense in habit, and with a deep maroon tint on the points of the leaves that contrasts finely with others of a lighter hue. S. montanum is another that should be in every collection, as also S. glaucum, S. pinosum, S. sulphureum. With the exception of canariense, all the above are quite hardy. Among gems may be mentioned Pachyphytum bracteatum, with its symmetrical rosette-like habit and thick fleshy leaves, like the point of one's finger, and of a beautiful creamy-white colour. A good contrast to this is Klemia repens, with its narrow, round, succulent leaves, covered with a fine bluish bloom; this loses its straggling habit when planted out, and does not grow above 2 inches high, or little more. If a shoot does straggle out of its place, it may be cut off and stuck in the ground, where it will strike readily: it is easily increased. Of the Pachyphytum, on the other hand, it is difficult to get stock.

The only way is to detach the leaves carefully from the stem and lay them in rings round a pan of fine soil, with the base of each leaf just touching the soil, but not buried. From the base of each leaf will spring a crowd of young plants, and the old leaf will perish. A warm and somewhat dry greenhouse temperature suits it best for propagating. It will be some time before there are many thousands of this in the country. A still scarcer plant, and a greater acquisition, is Echeveria pulverulenta. From the difficulty we have had in procuring a plant of this, and from inquiries we have made, it would appear there are hardly a dozen plants in the country at the present time. Imagine a massive plant of the habit of Echeveria metallica, but as white as snow almost, and you have E. pulverulenta. I must not omit E. glauca metallica and E. glauca major. The first of these two is, however, the best, and has more of the habit of E. metallica about it; though a hybrid, it comes true from seed. It is a free-flowering variety, and on this account it is very useful for conservatory work. E. retusa and retusa glauca are also very useful in this way, as they flower very freely at any period of the year, and continue long in bloom.

I had some plants in bloom early in spring for a long while, and they struck us as being exceedingly ornamental, and well adapted for baskets or stands. The flowering-stems were cut off at bedding-time, and they are now coming freely into bloom again outdoors. E. grandiflora is another grand variety, and I find it to be about one of the hardiest and most free growers among them. aeonium arboreum atropurpureum is another bold and characteristic-looking plant, a free grower, and easily propagated by cuttings. aeonium variegatum is also very effective. Rochea falcata is a good thing and a unique-looking plant, and grows freely outdoors. Of Sedums, our favourites are - S. hispanicum, S. luridum, S. lividum, and S. brevifolium. The two first are nice for carpeting, and form a dense mass; hispanicum is of a light silvery-green colour, and luridum is well indicated by its name, and is quite a contrast to the other.

I daresay many of your readers have seen the above plants and others of their class as inmates of the stove, greenhouse, or intermediate house; but their appearance under such circumstances gives one no idea of their character when planted out, and it is needful to see them arranged effectively outdoors in order to appreciate their effect.

Wortley. J. Simpson.