MODE OF GIVING AIE. 5 



round boards projecting two or three inches beyond it. When 

 this is done a kind of groove is formed ; and in this the cord to 

 let down and draw up the shade is coiled, one end being nailed 

 to it. The shading material is then nailed to the pole, it having 

 been first sewed together the size of the roof. The pole with 

 the canvass nailed to it should then be laid on the roof. A 

 flat, long, narrow piece of wood should be nailed firm to the 

 highest point of the roof; then stretch the canvass, and nail 

 the loose side to this flat piece of wood. Use some kind of 

 binding to this edge, and nail through that binding. Then take 

 hold of the other end of the cord, pull at it, and the wheel will 

 turn round, and, of course, the pole turn round also, wrapping 

 up the canvass neatly as it rolls up to the top or apex of the 

 house. The rope may be wrapped round a kind of fixed button 

 in a handy place, and tied there till shade is needed ; then loosen 

 the end of the cord, and let down the shade gently to the lowest 

 part of the glass, where a few stops of iron or wood should be 

 firmly fixed to prevent the pole rolling off the house and tearing 

 off the canvass from the flat piece of wood. To make this 

 canvass last longer, let a weatherboard be fixed on the top of 

 the house ; and when the shade with its pole is drawn up, it will 

 be under this weatherboard and be protected from wet. In 

 winter, when no shade is required, the canvass may be unfixed 

 and put away in a dry shed till spring. 



MODE OF GIVING AIE. When the thermometer indicates a 

 temperature too high it may be lowered by giving air. In 

 spring the external air will be too cold to be admitted direct to 

 the plants : hence it is desirable to let in the fresh air just over 

 hot-water pipes. To accomplish this make openings in the wall, 

 and fix to these opening sliding shutters. When these are 

 opened the air rushes in, and becomes not only warmed but also 

 charged with moisture arising from the tanks placed on the 

 ascending pipes, and is then highly beneficial to the health of 

 plants. To allow of the escape of the heated air, a few openings 

 should be contrived at the highest part of the roof. In summer, 



