io 4 WALL AND WATER GARDENS 



by R. ferrugineum and R. hirsutum, and in those of 

 the Tyrol by R. Chamcedstus. Still further east, in 

 the Eastern Carpathians, is found R. myrtifolium. It 

 is with the two Swiss kinds that our rock-gardens are 

 mostly concerned, though R. myrtifolium is also of 

 value, and will grow in many soils, though it prefers 

 sandy peat. Of these Swiss kinds R. ferrugineum is a 

 plant of the granite, while hirsutum belongs to the 

 limestone, as does also the R. Chamadstus of the Tyrol. 



Subjoined are lists of plants proper to the two 

 main geological divisions. It will be seen that in 

 each genus the species seem to be nearly equally 

 divided, so that in a garden devoted to one or other 

 there would be no exclusion of any of the more 

 important kinds of plants. Those that will do well 

 in either soil are not included in the list. If in the 

 case of some plants proper to the one formation we 

 find in England that they can be grown in the other, 

 it will not affect the general utility of these lists, which 

 are meant to point out the conditions under which 

 only they are found in nature, and under which they 

 thrive best in gardens. It must also be understood 

 that the lists do not aim at being complete. They 

 comprise only the most characteristic examples of the 

 species special in nature to the limestone and the 

 granite, and that have been tried and proved either 

 in the Jardin d'Acclimatation at Geneva, the newer 

 garden " Floraire," or at one of the two experimental 

 stations in the mountains that are on the limestone 

 and on the granite respectively. 



It must also be understood that a good number of 



