334 FORCING DEPARTMENT. 



back trellising springs from within nine inches of the 

 back wall, and goes up in a sloping position, as shewn 

 in the section ; the whole trellis being composed of 

 iron rods, and the meshes left about six inches wide. 

 The roof ends, and front lights of these houses, are 

 all constructed with cast iron rafters and wall 

 plates ; the sashes, with wooden frames, and copper 

 bars, as illustrated in Plate 18, and glazed with 

 crown glass, by which, in a roof of this kind, more 

 sun and light are admitted in March, when they are 

 so essential to early forcing, than one composed of 

 wood, will admit in April. 



PEACH-HOUSE BORDERS. 



Having already given a description of the con- 

 struction, and the materials used in the erection of 

 the Forcing-Houses here, I will now proceed by 

 making a few brief remarks on the formation of 

 the border, which is of no small importance to the 

 future success of the Peach and Nectarine. Although 

 these trees will grow, and even produce fruit in 

 various soils, for a few years, they are, unques- 

 tionably, more subject to mildews, cankers, and 

 other diseases, in some soils, than in others, and, 

 consequently, of less duration. It is, therefore, a 

 matter of some consideration to select such soils as 

 are most congenial to the health and preservation of 

 the trees, as I have frequently met with instances of 

 their being worn out, and under the necessity of 

 being cleared away, and replanted with others, 

 where they should have only been in their prime and 



