422 



Description of a Design for the 



Fig. 76. is a design which might, if expense were not an 

 object, be substituted for fg. 75. In it the whole of the area 



(about an acre) is covered with a conical roof of glass, 200 ft. 

 in diameter at the base, and 1 00 ft. high in the centre. The 

 plan shows the area laid out in concentric beds and walks ; 

 with radiating walks, and four radiating partitions to separate 



