544 Notices of Communications to the Society, of which 



plants. The cost of these vessels is two shillings and two 

 pence per foot, superficial measure. They may be made of 

 any length not exceeding five feet. The most convenient 

 size for Greenhouse plants or Creepers, is about three feet 

 long, twelve or fifteen inches wide, and twelve or fifteen 

 inches deep. The Slate is about three-eighths of an inch 

 thick, rubbed to a smooth surface. The bottom is grooved 

 into the sides and ends; and where joined at the angles, is 

 secured by Iron screws to a triangular piece of Slate inside 

 the Trough. Slate boxes have been adopted by Mr. Atkin- 

 son in consequence of wood soon rotting, and of the great 

 inconvenience of renewing the boxes, without injuring the roots 

 of the plants. The Slate Troughs are very durable, and may 

 be painted any colour outside, and ornamented, if required. 



A Model of a block and portion of a rafter were exhibited 

 on the 17th of June, from the Garden of Gregory Gregory, 

 Esq. at Rempstone, in Nottinghamshire. They were sent 

 to illustrate a simple and effectual method of constructing 

 temporary glass-houses for forcing any particular trees 

 trained on the open wall. The blocks are permanently 

 built into the wall under the coping, at such exact distances, 

 that lights will fit in between any two of them, upon the 

 moveable rafters which pin in to the end of the blocks. The 

 lights employed are the same as are used for hot-beds or 

 other purposes in the garden, and are applied in two lengths, 

 forming any angle to the wall which the gardener may choose. 

 Along the front of the border, a temporary dwarf wall is 

 built opposite to the trees intended to be forced, in which 

 upright glass, if required, is fixed, or the lights are brought 

 down so as to rest on the wall, if no upright glass is used. 



