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Transactions of the Horticultural Society. 



favour of water as Mr. Squib, and considers earthenware pipes 

 as perfectly sufficient, and, perhaps, in some cases, superior to 

 metal, from the genial though almost invisible moisture which 

 exudes through the pores of the material. 



At Sundridge Park, an extensive conservatory and two 

 vineries are heated by hot water, which is impelled through 

 the pipes, to a certain extent, by the expansive power of the 

 steam in the boiler. This work is believed to be the invention 

 of Count Chabbanes ; it is very ingenious, and deserves to be 

 recorded as one of the first steps in the progress of heating by 

 hot water; but the mode described by Mr. Whale is so superior, 

 so much more simple and economical, that it is not likely 

 Chabbanes's method will ever be repeated. The kitchen-gar- 

 dener here, Mr. Thomson, understands both methods per- 

 fectly, prefers that of Mr. Whale, and has constructed a model 

 for heating a vinery by Mr. Whale's method, where the pipes 

 must pass under a footpath considerably below the level of 

 the boiler. 



As the water, by all these plans, circulates on a level, it 

 may, at first sight, appear that this is a necessary condition to 

 success; but a little reflection will render it evident that, if the 

 height which the water stands in the boiler and the reservoirs 

 be equal, and as high as the highest part of the pipes, the 

 circulation between them will take place, however low the 

 pipes may descend. If the covers of the boiler and reservoirs 

 be fixed and watertight, a perpendicular pipe from each 

 (jig. 54. a a\ kept filled to the proper height, will have the 



same effect as if the full dimensions of the boiler (b) and reser- 

 voir (c) had been so extended. The pipes between a boiler 



