GARDEN STRUCTURES, 



209 



This conservatory (fig. 270) is constructed of 

 wood, and is 30 feet long and 20 feet wide. 

 There are gratings in the base for the admission 



of air in cold weather, so that it may pass in close 



to the hot-water pipes, and not in cold currents. 



Fig. 271 represents a handsome conservatory 



Fig. -270.— Conservatory. 



built by Messrs. Mackenzie & Moncur in Sefton 

 Park, Liverpool. It is of rolled-steel and glass, 

 and is 110 feet in diameter by 70 feet in total 



height. It is elegant in design, and excellent 

 as a house for the healthy growth of plants. 

 Hot-houses. — These are structures in which 



Fig. 271.— Conservatory, Sefton Park, Liverpool. 



plants from the tropics are grown. The prin- 

 ciples by which their construction should be 

 regulated have reference to the three great 

 agents of vegetation— heat, light, and moisture 

 — principles which ought to be kept in view in 



the planning of all kinds of plant structures. 

 Vol. I. 



The stove differs from the greenhouse chiefly 

 as regards heat, for which in the former more 

 ample provision requires to be made. It also 

 differs in the mode of ventilation. A green- 

 house may be made a stove by increasing the 

 number of hot-water pipes. In the culture of 



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