154 PARKS AND PLEASURE-GROUNDS. 



Horticulture hi tlie ^ Encyclopaedia Britannica/ or to 

 the reprint of that article in ^ NeilFs Gardening/ The 

 latter, which we are permitted by the publishers to say 

 we aided in getting up, particularly the department 

 now referred to, AviU be found useful by gentlemen 

 acquiring first notions on the subject, as it is almost 

 wholly free from technical details. Since these ^fA^orks 

 were published, the system of roofing glass houses by 

 small glass ridges and furrows has been greatly improved 

 by its inventor Sir Joseph Paxton, and employed in the 

 construction of the Crystal Palace, which but for this 

 method of roofing might never have existed in its uni- 

 versaUy-admired form. In our practice in this depart- 

 ment of gardening, we have found the ridged roof to be 

 admirably adapted to greenhouses, conservatories, and 

 even to the minor structures employed for the rearing 

 of plants. 



