456 THE MAGAZINE OF HORTICULTURE. 



M, Yan der Straeten adds the following explanation of the 

 figures : — 



The frame shown in the drawing was placed against a wall 

 of a new construction, and which has existed for more than 

 25 years. The wall is formed of a framework of oak, form- 

 ing squares, in which are set on edge two courses thick of 

 blue paving tiles, 9 inches square, so as to break joint. This 

 wall is 6.^ feet high, and is covered by a board, x, which 

 serves for a coping, and is supported from sash to sash by 

 pieces of wood, y. In the coping boards are fixed hooks 

 which hook into two eyes on each sash. The sashes rest 

 upon oak posts, z^ fixed in the ground to the depth of 3 feet 

 3 inches. Each post supports the ends of two sashes, which 

 rest partly on the one and partly on the other, as at w. The 

 sashes iS* are made of pine, and are framed and glazed in the 

 ordinary way. The intervals between the posts are closed 

 up in severe frosts by straw mats, t, t, t, which can be re- 

 moved at pleasure. They are kept from blowing in or out 

 by being tied to laths nailed to the posts. 



This is so easily moved that the whole of it, though 58 

 feet 4 inches in length, can be removed by two men in eight 

 minutes, and again replaced in twelve minutes. When the 

 moveable part of the structure has been taken down, there 

 only remain the posts, the use of which no one would sus- 

 pect. Besides effecting its principal object — the protection of 

 fruit trees, such as the peach, apricot, and vine, &c. — the 

 structure serves at the same time for the production of early 

 vegetable crops, for which purpose a border 3| feet wide is 

 available. 



The expense of the entire structure was at Brussels £7 Os. 

 9d., or about 2s. 5d. per foot run. It is composed of the 

 following items : — 



Carpenter's wages, . 



Cost of wood, (oak and pine), 



Smith's work, 



Oil, white lead, and putty. 



Straw, .... 



