62 
CONSERVATIVE WALLS. 
that portion of the border in which the principal roots lie ; and where the canvas, 
or other protection actually given to the wall, cannot by any means be made to 
extend over the border, a coating of dry litter should be spread over it as soon as 
severe weather commences, and be retained on it till the opening of the spring. 
Bearing in mind all that we have advanced, we request the readers attention 
to the somewhat novel plan we now produce. Fig. 1 is an elevation of a highly 
ornamental conservative wall, which may be extended either way to any required 
length. The scale is one-twelfth of an inch to a foot. By referring to fig. 2, the 
ground plan of the same part will be seen, on a parallel scale. This shows the 
furnaces at the back, in the form of gratings ; the flues, a a, which are carried under- 
ground, from one division to another ; and the space for plants, b b. The elevation 
in fig. 1 will be perceived to consist of plain pillars, crowned by the chimneys con- 
nected with the flue, and by simple vases. The space between the pillars supporting 
the chimneys stands much forwarder than the rest, and is faced by a trellis. The 
receding parts can be covered at pleasure, with a glazed light or lights, which, when 
not wanted, can be made to slide on rails, behind the projecting portions. The 
rail at the back of the screen wall is shown on a larger scale, in fig. 3 ; and the 
bottom of the sliding light, with its revolving roller, is exhibited at fig. 4. A side 
view of the roller inserted at the base of the sash frame is given in fig. 5. 
A review of the chief features of the plan will leave the following general ideas. 
The wall is composed of alternate prominent and retiring compartments. Each of 
the former includes two stone pillars, which stand out a little beyond all the 
remainder, and are to be left uncovered ; while between these is a division, over 
which is extended a trellis for supporting the hardiest sorts of climbers, and those 
