8 THE BOOK OF THE PEACH. 



more light to the interior through the back roof than 

 would be obtained in the case of a " lean-to " house. 



In both, front ventilation may be admitted 

 through continuous front glass lights worked by 

 machinery, or the front ventilation may be effected 

 by a series of boxes built in the front brickwork, 

 and regulated by either sliding or hanging shutters 

 (see Figs. 4 and 5). The top ventilators should open 

 the full length of the roof by machinery Wolland's 

 continuous ventilating gear is all that can be de- 

 sired in this direction. 



Another structure is that known as the span-roofed 

 house (see Fig. 6). This should run north and south, 

 so as to admit of the trees trained up under both 

 roofs sharing equally the benefit of the sunshine 

 throughout the day from the end of March onwards. 

 The span is invariably used for the production of 

 fruit, both early and late in the season, where no 

 wall-space is available for the lean-to or three- 

 quarter span. The span-roofed structure has much 

 to commend it to those interested in the production 

 of all kinds of fruit and most kinds of plants, not 

 only on the score of economy, but also from a 

 cultural and productive point of view. 



CONSTRUCTION OF PEACH-HOUSES. 



Should the site whereon it is proposed to erect 

 the peach-house, or a block of peach-houses, as the 



