12 THE BOOK OF THE GREENHOUSE 



north and scuth, and if one end is formed by an already 

 existing wall this should be the north end. Such houses 



are more 

 easily man- 

 aged, and 

 their occu- 

 pants always 

 happier than 

 is the case 

 with houses 



built from east to west. A 

 span-roofed house, built 

 sufficiently wide to permit 

 of a central stage in addition 

 to two narrow side stages, 

 is perhaps the very best 

 possible form of house, as 

 its occupants can always be 

 arranged so that they may 

 be seen at their best, but, 

 where the width is only 

 sufficient to admit of two 

 side stages with a path 

 down the centre, I consider 

 the span a wasteful form of 

 house and one in which 

 plants can never be arranged 

 to look well, as, unless the 

 house is lofty, the tallest 

 plants are perforce brought 



VENTILATION BY MEANS OF FRAMED i , ' r % TS 



LIGHTS graded away from, instead 



of towards, the path. 



Lean-to houses are those in which the roof takes one 

 slope only from back to front. For a position against a 

 wall this is the cheapest and perhaps the best form of 



