150° BRITISH FERNS. 
brick walls of fruit-gardens, particularly selecting the 
uppermost line of mortar, which may perhaps be pro- 
tected by a coping of brick: this is ever a favourite 
Station for cobwebs and Wall Rue. 
The Wall Rue is a difficult plant to cultivate; it 
Seems to disapprove of the attentions of the gardener, 
time, and to replace them as soon as the ferns are 
