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Hot-water in open Gutters. — Mr. Griffin, gardener 

 to Mrs. Wells, of Cowley, near Exeter, has published 

 the following remarks upon this mode of circulating 

 hot-water. 



The open trough, or gutter, may be applied to a 

 boiler of any construction. The water flows from 

 the top of the boiler, through a four-inch pipe, into 

 troughs made of cast iron, of the following dimen- 

 sions : inside measure six inches wide at the top, 

 three inches and a half at the bottom, and seven 

 inches deep ; the trough is constructed in lengths 

 three feet long, neatly fitted together by a rivet in 

 the bottom, and one on each side near the top. The 

 water returns in a cast iron pipe, three inches in dia- 

 meter. There are thin iron lids or covers, of the 

 same length at each portion of the trough, to fit 

 upon the whole length of the apparatus, so that the 

 degree of humidity may be regulated by making up 

 some portions of the covers, without disturbing the 

 others. The troughs or gutters might be made of 

 various materials, but Mr. Griffin prefers iron. The 

 heat is diffused from the surface of the trough or pipes, 

 nearly as quickly as it would be from copper or zinc, 

 and retains the heat much longer. The width and 

 depth of the troughs should be varied according to 

 the plants intended to be grown in the house. An 

 orchidaceous house requires a wider surface on the 

 top than those intended for the growth of ericse and 



