4.6 THE GKAPL CULTUBIST. 



The places for ventilating the house may also be 

 arranged to suit the convenience or fancy, but they 

 should be mainly at the top. The sashes should be 

 made in two sections the upper one much shorter than 

 the lower, and arranged so that it can slide down over 

 the other, and leave an opening at the peak, as shown. 

 Or the sash bars may be continuous from sill to peak, 

 with alternate sections left for hinged ventilation ; in 

 fact, there is no end to the modern devices for ventila- 

 tion of houses and their general construction, as may be 

 found in such modern works as "Greenhouse Construc- 

 tion," by L. R. Taft, Orange Judd Co., N. Y., which 

 will, of course, be consulted by those who intend erect- 

 ing expensive structures of this kind. The short per- 

 pendicular sashes at the sides of the house may be made 

 so that they can be opened ; but this will seldom be nec- 

 essary, for if the upper ones are opened the heat will 

 pass off rapidly, and sufficient fresh air will find its way 

 into the house through the small openings, of which 

 there will always be more or less. There are hundreds 

 of methods of ventilating glass structures ; the object of 

 all is the same, hut these I have mentioned are the most 

 simple and will answer every purpose. 



The slope of the roof should be at an angle of from 

 35 to 45 degrees ; the one shown in the engraving is at 

 an angle of 35 degrees, or very nearly. 



A Single-roofed House. The single roof, or 

 lean-to house, is often preferred, by propagators in the 

 more northern States, as it is less exposed to cold, being 

 frequently built against a sidehill or some building; 

 where such a protection is not convenient, then a wall is 

 built running east and west, or nearly so, and the roof 

 is placed against this, sloping to the south. 



Fig. 13 shows a lean-to house, with interior arrange- 

 ments similar to that of the span-roofed house. The 

 furnace and general storeroom is built against the north 



