9 2 



Annals of Horticulture. 



cable only for small houses. But they are more expensive to 

 keep in repair, and are not so durable. The lines for such a 

 house are straight, and for this reason the structures are not so 

 handsome as the iron ones. 



" Five men exhibited models of houses with wood frames. 

 The frames were mostly of pitch-pine, the parts being held 

 together by plates or castings of iron. About twenty exhibits 

 z/^ron of iron-framed houses were made. Such houses are generally 

 f work" more durable, and their arched roofs give them a much more 

 elegant appearance than houses which have the framework of 

 wood. But the question of radiation must be considered. 

 In very cold weather the moisture which collects upon the 

 iron falls upon the plants in perfect showers. Sash-bars so 

 formed that the water will be carried in grooves to the side of 

 the house were exhibited. In order to retain the advantages 

 of both iron and wood, some builders exhibited models in 

 which the iron frame was covered with a lining of wood. 

 This lining is used only in the interior of the house ; it is 

 fastened to the iron by means of clamps, and can be removed 

 when desired. 



" Some builders put two layers of glass upon their houses 

 in order to diminish the radiation of heat. This method of 

 glazing can be used on houses having a frame of wood, or of 

 Double wo °d an( i iron. The inner glass is not puttied, but is held 

 glazing, in place by small hooks, or by strips fastened to the sash-bars. 

 One house had small ventilators so arranged that a current of 

 air passed between the two layers of glass, thus keeping the 

 glass free from condensed moisture. 



" I shall not describe the various contrivances for opening 

 ventilators, each exhibitor having a different device, a simple 

 handle, an iron rod, levers, etc. The ventilators, also, were 

 of many sizes and of different shapes. 



"A large number of builders exhibited frames designed to 

 protect plants trained upon walls. These frames contained 

 movable panes of glass ; the lower parts of some contained 

 Frames P ane ^ s °f wo °d which fitted into grooved iron bars. The glass 

 is fastened to iron bars, also, these bars being grooved to carry 

 away the condensed moisture which collects upon the glass. 

 A peculiar sash was exhibited by one builder. It is called 

 the 'universal frame ' ; its size is about 4^ X ij^feet, and it 

 contains four panes of glass. These frames can be used for 



