662 Remarks OJI laying out 



same time, it might be worth while, in the infancy of an arboretum, 

 to combine with it a herbacetum, with the understanding that, as 

 the trees and shrubs advanced on the herbaceous plants, the 

 latter should be removed. Nothing of this kind, however, should 

 be attempted where there is not a very large space allowed to 

 work upon. 



Exotic Gardens may be of different kinds ; and in each kind 

 the plants may either be grown in pots or boxes, or in the free 

 soil. For our part, we so greatly prefer the latter mode, that 

 we should not think a public garden on the former plan sufficiently 

 distinct from the plant-houses of private gentlemen and nursery- 

 men, to be worth executing. An African garden might consist 

 of an acre or more, chiefly of sandy peat, planted with the trees 

 and shrubs of the Cape ; and among them, near the walks, the 

 beautiful bulbs of that country. A heathery in this garden might 

 be limited to the heaths of the Cape; and a palmatum to a col- 

 lection of palms. An Asiatic garden might be devoted to the 

 bamboos and Scitamineae ; a Peruvian garden to the araucarias, 

 and other trees and plants of Peru ; and an Australian garden, 

 to the trees and shrubs of Australia, &c. The roofs to these 

 gardens should^ as we have before stated, be raised on parallel 

 rows of hollow cast-iron columns, to the height of 100 ft.; and 

 the sashes should be hung in such a manner as to be opened, 

 when necessary, simultaneously by a steam-engine, to any degree 

 of extent as far as the perpendicular, in order to admit the direct 

 influence of the sun, whatever might be its angle, and of a shower 

 of rain. See what we have said on this subject in the Encyc. of 

 Gard., in preceding volumes of this Magazine, and in the Mag. 

 Nat. Hist., i. 385. 



LANDSCAPE-GARDENS. 



Gardens of this description are scientific, only with reference to 

 the principles of composition in painting and architecture. They 

 are much more difficult to form than either promenades, parks, 

 scientific gardens, or gardens for recreation and refreshment. 

 They are also more expensive ; because nothing is to be accom- 

 plished of any great interest without removal of earth, the form- 

 ation of pieces of water, and the production of rocks ; and without 

 trees and shrubs of at least six or eight years' growth. Not only 

 the designer of such gardens must have the eye and the mind of 

 a landscape-painter, but he must, for the execution of some parts 

 of them, procure a workman who has such an eye, or otherwise 

 superintend the execution of such parts himself. We shall 

 divide these gardens into five kinds; viz. Fac-simile or me- 

 chanical imitations of natural scenery ; Picturesque imitations ; 

 Gardenesque imitations ; Imaginary scenery ; and Geometric sce- 

 nery. 



