Rock Gardens. 



255 



it is not necessary to have the concrete foundation shown in Fig. 385, although 

 the latter is the best form for the small moraine, affording the most complete control 

 over the water supply. In wet weather the inlet pipe is shut and the outlet opened ; 

 in dry weather the converse. Where a slope is available, Fig. 386 shows a 

 simple but efficient type of moraine. A half-inch pipe perforated at every six inches 

 is led along the top six inches below the surface. Flat rocks are useful, as in the bog 

 garden, for access to the plants. Fig. 387 shows the construction of a moraine 

 which has been found to work well in practice. 



'PEBFOKATED PIPE 



SMALL- GRANITE 

 CHIPS SPRINKJJA/C 



OF LEAF MOULD 

 ^A LITTLE OLD 

 MORTAR RUBBLE 



.. STONES SUCH 



SECTIONAL AS PEBBLES OR 



VIEW. C08ES 



FIG. 386. CONSTRUCTION OF MORAINE ON SLOPE 



TITY OF SAND, . 



THE WHOLE LATER. 

 9 INCHES TO 

 ONE. FOOT THICK 



PERFORATED 

 PIPE 



QRANITE CHIPS ETC 

 AS IN FIG. 386. 



EARTH 'OR RUBBLE- ' 

 " " " 



FIG. 387. CONSTRUCTION OF MORAINE ON LEVEL GROUND. 



In this moraine (Fig. 387) the following, among other Alpines, flourish and bear 

 flowers in profusion : Androsace brigantiaca, carnea, lanuginosa, primuloides, villosa ; 

 Asperula suberosa ; Antirrhinum asarinum ; Arenaria purpurascens ; Campanula 

 collina, pulla, pulloides, Steveni nana, waldsteiniana ; Cyananthus lobatus ; 

 Dianthus Freynii, microlepis, neglectus ; Edraianthus Pumilio, pumiliorum ; 



