562 Notices of Communications to the Society, of which 



subsequently languished and shrivelled up ; with the Apple 

 trees, in some cases, the same consequence was observed, 

 and when these were heavily laden with fruit, the whole 

 bough was liable to be broken off at the ringed place, by a 

 high wind. All the boughs above the incision assumed an 

 autumnal appearance much ealier than usual, and lost their 

 leaves prematurely. This would naturally be the case where 

 the union of the edges of the ring had not taken place be- 

 fore the autumn, and when such re-union is not made, it 

 may be concluded that the ring was originally too wide. 



November 7, 1820. A communication was received from 

 Mr. James Brown, gardener to the Marquess of Bucking- 

 ham, on the advantages of a span-roofed Glass house for for- 

 cing Peaches. The house described runs from north to south, 

 is fifty feet long by twelve feet wide ; the frame-work stands 

 on upright brick- work, three feet above the ground level, 

 having no upright glass ; the slope of the glass is ten feet 

 each way, facing east and west; the flue entering at the 

 north end (which is all of brick) is carried round the house 

 and goes out into the chimney, over the fire place. The 

 south end is upright glass, in which is the door of entrance. 

 The trees, being half-standards, are planted on the outside 

 borders, and are carried in a sloping direction into the house 

 through the wall under the glass ; the branches are trained 

 to wires strained in horizontal lines ten inches from the glass. 

 This construction of houses has the greatest possible produc- 

 tive surface exposed to the light in a given space ; but the 

 external atmosphere having access to it through the glass on 

 all sides, it is not adviseable to use it for very early forcing. . 



