72 



ROCK GARDENS 



especially when negotiating the bolder masses, 

 it may often be found necessary to deal with 

 spaces, or, to use a more correct term, fissures, 

 between two rocks. These are of three kinds, 

 oblique, vertical, and horizontal. 



The oblique fissure looks externally very 



Fig. 3. 



much the same as the horizontal, the differ- 

 ence being that in the case of the former 

 it slopes down towards the back, while the 

 latter keeps to the same plane. In both of 

 these it is very important to make sure that 

 the under rock projects beyond the upper, 

 otherwise rain falling on the sloping face 

 of the rock above will miss the fissure 



