ROCK-WORK. 237 



or a holly. The walks, arranged in long concave curves, 

 may communicate here and there with one another. A 

 dial, a few seats and arbors, with an urn or two, or a vase, 

 may he introduced with good effect. It is to be regretted 

 that so few good specimens of this species of flower garden 

 have hitherto been executed in Britain. 



Amongst the accompaniments of the flower garden may 

 be mentioned the Rock-work. This consists of variously 

 grouped masses of large stones, generally such as are re- 

 markable for being figured by water-wearing, or for con- 

 taining petrifactions or impressions ; and into the cavities 

 between the stones, filled with earth, alpine or trailing 

 plants are inserted. These are numerous, and maybe end- 

 lessly diversified. Several species of Helianthemum, Gen- 

 tiana, Pentstemon,and Primula; Campanula pumila, blue 

 and white varieties, carpatica, and nitida; Saponaria 

 ocymoides, and Adonis vernalis may be recommended. 



Alpine or Rock Plants. — Soldanella alpina, Clusii, and 

 minima. Silene acaulis, maritima plena. Sempervivum 

 arachnoideum, grandiflorum, and even the common house- 

 leek or fouet of Scotland, S. tectorum. Dwarf crimson- 

 flowered Raspberry, Rubus arcticus. Dracocephalum 

 grandiflorum. Potentilla tritentata. Phlox subulata, 

 setacea, virginica, and stolonifera. Oxytropis uralensis. 

 Lychnis alpina. Linaria alpina. Liatris pilosa and 

 spicata. Hippocrepis comosa. Epimedium alpinum. 

 Aubrietia deltoidea. Dryas octopetala and Drummondii. 

 Cardamine bellidifolia. Aster alpinus. Anemone pal- 

 mata, and- Pulsatilla or pasqueflower. No plants produce 

 a finer effect than the different varieties of the common 

 rock-rose, Helianthemum vulgare, double-flowered, pale, 

 yellow, and dark orange-colored. iEthionema membrana- 

 ceum. Aletris farinosa. Iris tenax. Geranium Walli- 



