CONSTRUCTION OF HOUSES. 27 



roof; the canvass, when spread over the glass, 

 should have a roller fastened along the bottom, 

 with a small wheel at one end, to wind the cord 

 on, when it is lowered down for shading ; a hook 

 should be fastened to the opposite corner for the 

 cord, so that it may keep the roller in its place 

 at the ridge of the roof, when not required to be let 

 down : by this means the house may be shaded 

 without any trouble, and as the days are some- 

 times very changeable in regard to the weather, 

 it is desirable that these things be easily aiTanged, 

 for, in warm show^ery weather, attention to shading 

 is of the first consequence ; during the winter 

 months, or from October to the latter end of 

 April, no shading will be required, as they should 

 then have the full benefit of the light, particu- 

 larly those that are growing, for there will be, 

 of course, some still growing. 



