PK0CBKDING8 OF TUB 



June 51, 1942. 



ORDINARY MKKTING. 

 The following Candidates were elected Fellows of the Society : 

 (Joortrt* Clivi', Ks(j. 



W'illiinn H;ukl)l(K k, Esq., DiMiinark Hill. 



Aloxaiuler Murray, Ks(i., INI. I*., Orleans Ilduse, Twickenham. 



(ioorp' 'i'oinliiis, Ksq., 1, Carlton Mouse Terrace j and Uiby 

 Hall, Liiicolnsliirc. 



Mrs. Eliza Whatman, 5, Orchard Street, Portman Square ; 

 and Vinters, Maidstone. 



A Paper was read, from Mr. W. E. Rendle, of the Union Road 

 Nursery, i'lymouth, upon an economical mode of heating Forcing 

 and other Houses without pipes, Hues, hot dung, or any ferment- 

 ing material ; tlie following is a description of the plan, in a 

 house 24 feet long and S feet wide, a wall about 3 3 feet high is 

 raised so as to form a pit ; a space about 20 inches wide being 

 left all round for a walk. On tliis wall stands a wooden tank, 

 4 inches deep, and divided lengthwise, with the exception of a 

 few inches at one extremity, by a partition. This tank is filled 

 with water, and is connected by means of a small pipe with one 

 of Shewen's conical boilers. Upon lighting the fire, the water, 

 as soon as it becomes heated, rises of course to the aperture c, 

 and forms a current to the point d, where a pipe is fixed in the 

 bottom of the tank, through which the water presses down 

 into the boiler, and thus a regular circulation is kept up. 

 The water can, in the course of an hour, be raised to 150°, at 

 the cost of about twopennyworth of fuel, and a very small 

 fire will maintain it at that temperature. On the top of the 

 tank are slate slabs, upon which a layer of sand or sawdust 4 

 inches deep, is spread ; this is surrounded by a board on edge, 

 to prev ent it from falling over the sides of the tank. 



This plan is very simple and economical, as the heat which the 

 water conveys is immediately communicated to the sand or saw- 

 dust, and from thence to the roots of the plants plunged in those 

 materials. On this account it is well adapted for propaga- 

 ting houses, and indeed for any buildings in which Pines, Cu- 

 cumbers, and Orchidaceous plants are cultivated. Any requi- 

 site degree of moisture in the atmosphere may be obtained by 

 leaving apertures in the slate slabs, which cover the tank, to allow 

 the steam to rise through. 



The following is a sketch of the apparatus : a., sides of the 

 tank, 4 inches deep, 20 feet long, and 5 feet wide 5 6., partition 



