362 



Notes on GarJefis and Country Seats. 



substances, according as the object was to retain moisture; to 

 evaporate moisture, in order to prevent the plants from damping 

 off; to increase the heat, in which case dark fragments of stone 

 are used ; or to diminish it, which is effected by the employment 

 of white pebbles, which, by reflecting the light and heat, keep 

 the ground cool. The following is a list of the principal genera : 

 — Saxifrages, sedums, Cistus, pansies, rock pinks, anemones, 



