PRACTICAL BOOK OF GARDEN ARCHITECTURE 



fruit can be grown. Through the transparent wall, 

 the light of the sun can penetrate to the north wall, 

 making this of equal value to the south side, instead 

 of being barren of results, as it necessarily is with 

 other formations. These French gardeners will ex- 

 plain that there is little difference between the north 

 and south faces of the glass espalier that the north 

 face is heated by the solar rays, which traverse the 

 glass, and the south face is cooler than the south side 

 of a masonry wall, "for the very reason that some 

 of the incident solar radiation is transmitted through 

 the glass, and consequently less is reflected and 

 absorbed. ' ' A glazed roof projecting a foot or more 

 over each side of the glass wall, helps to reflect the 

 sun's rays, and provides additional attraction as an 

 ornamental garden feature. Only those who have 

 travelled in France, and visited the gardens in which 

 glass espaliers are given a prominent place, can 

 appreciate their architectural attraction. 



Masonry walls are the favorites in England. Ac- 

 cordingly the American country seats under the care 

 of English gardeners show the best types of fan- 

 shaped trees. The brick and stone walls have an 

 overhang of eighteen to twenty inches of glass roof- 

 ing. This projects over the south side, against which 

 the trees are trained to reach nearly to the roof. 

 The usual argument in favor of the masonry wall, 



256 



