Cultivation of Rock Ferns. 



23 



- Polypodium Robertianum, the limestone polypody, 

 requires a dry position, and a mixture of sandy loam 

 and chalk. 



Woodsia ilvensis, the oblong Woodsia, must have 

 shade and shelter : and the most perfect drainage. 

 Make a little hollow of broken bricks, or other porous 

 substances. Fill with a mixture of yellow loam and 

 silver sand. In this the plant will luxuriate. 



G-EOtTP OF SCOIOPENDEITTMS ON BOCK-WOKE. 



