ROCK-WORK. 237 
or aholly. 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 may be end- 
lessiy 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 fowet of Scotland, 8. tectorum. Dwarf crimson- 
flowered Raspberry, Rubus arcticus. Dracocephalum 
grandiflorum. Potentilla tritentata, Phlox subulata, 
setacea, virginica, and stolonifera. Oxytropis uralensis. 
Lychnis alpina. lLinaria 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. Aithionema membrana- 
ceum. letris farinosa. Iris tenax. Geranium Walli- 
