136 DESCRIPTION OF HOTHOUSES. 



five to sixty degrees during the night: in autumn 

 or winter it is as low as fifty- five or fifty degrees." 

 He has no hesitation in stating that, when coals 

 are moderate in price, it is the cheapest plan he 

 has seen adopted ; and he sends the particulars 

 to the Horticultural Society, <f in hopes that they 

 may assist in establishing Mr. Knight's views on 

 the subject of cultivating the pine apple." 



Another plan recommended by some for a 

 pinery, is to have the whole roof formed of 

 glass-work; and instead of extending length- 

 ways east and west, as described in the first 

 plan, it is made to extend lengthways from 

 south to north, with the top, of a ridge-form, 

 sloping equally on both sides, east and west ; 

 the walls may be raised of an equal height all 

 round for fixing the glass-work upon, varying 

 from one foot and a half to three feet, and the 

 upright sashes along the sides, from two to three 

 feet or more in height, according to the height 

 of the wall, and to be made to slide or swing 

 open; the sloping top-glasses, reaching from 

 the top of the uprights on both sides, to meet 

 in the centre of the roof, and the sashes made 



