THE CONSTRUCTION OF THE FORCING-HOUSE. 



long), which are large 

 enough to make and control 

 their own temperature and 

 to employ all the time of a 

 man, it is probably better, 

 for the sake of the conve- 

 nience of hauling to and from 

 them and the ease of repair- 

 ing the roofs, to have them 

 separated from other houses 

 by a space two or three rods, 

 or more, wide. 



It is probably true that 

 the best direction or expos- 

 ure for an even-span house 

 is from north to south, be- 

 cause both sides of the struc- 

 ture then receive an equal 

 amount of sunlight during 

 the twenty-four hours. It is 

 not always practicable, how- 

 ever, to run the houses north 

 and south, and when it is 

 not, it is better to run them 

 directly east and west, and 

 to break the roof into un- 

 even spans . J ust wh i ch spa n 

 should face the south, whether 

 the long one or the short 

 one, is a matter of dispute. 

 It probably depends very 

 largely upon the kind of 

 plants to be grown, and 

 the slope of the land, and 

 upon the exact exposure ; 

 but it is, no doubt, true that, 

 for general conditions, the 



