The Garden Under Glass

12 THE GARDEN UNDER GLASS to have an open trellis standing immediately over the hot-water pipes I would advise the erection of a framework staging on which sheets of corrugated iron could be placed. This could be covered with clean shingle sifted from gravel, washed, and capable of passing a quarter-inch sieve. The trellis staging could then stand about four inches over this staging and might rest on clean bricks. The idea is to keep the lower staging saturated Diagram 5.—Types of Greenhouse Staging: 1. Tiered staging for centre of house. 2. Scheme to prevent insects crawling on to staging ; a, pan filled with water. 3. Double staging, trellis standing on bricks over solid staging covered with shingle. 4. Side staging formed in tiers. with moisture with-out difficulty, and to allow a free circula-tion of air beneath and around the plants. It would be found a considerable advantage to divide the staging at the top into three parts, each being a foot wide. Th en th e plants could be ar-ranged in tiers or on the flat, according to the exigencies of the case. The middle staging could also be of the trellis pattern, but liere a double staging would be unnecessary as there are no hot-water pipes beneath. I would advise a tiered staging of nine shelves, each shelf