388 On the Construction of a Stove for Plants, 



the conceived plan, and fully answering my expectations, 

 after six months experience, I am desirous of communicating 

 an account of it to the Horticultural Society, for the infor- 

 mation of the Members, not doubting, at the same time, but 

 some of them will be able to suggest other ideas, that 

 may render the plan more complete. With respect to the 

 consumption of fuel, it is not in my power absolutely to 

 determine, whether any thing material is saved, or not, 

 although I am inclined to believe, that much less is required; 

 but I am prevented from making the experiment, as this 

 house is nine feet longer, and from twelve to fourteen inches 

 higher, than my former, containing nearly 1500 more cubic 

 feet of air to be heated. I have found, upon trial, that coke 

 (such as is made by the Gas-light Company) smith's coals, 

 and cinders, mixed in about equal proportions, answer quite 

 as well as coals alone. 



As this house is constructed, the third return of the flue, c, 

 which runs along the front, at the distance of forty-five feet 

 from the fire, is nearly, if not quite, as much heated, as when 

 the whole flue is exposed, at the distance of only ten feet ; the 

 two first lengths of the flue, bb, being within the chamber, 

 under the pit, warm the air in it, and if kept closely confined, 

 will continue warm to a considerable degree, for twenty-four 

 hours after the fire is extinguished, producing bottom heat to 

 the plants. I first made the chamber with only the bottom 

 registers, h li h, for the purpose of letting out the air ; 

 but finding the heated air did not escape sufficiently, I have 

 since added five more registers, i i, placed above the first ; all, 

 or any, of which may be opened or shut, at pleasure. This 

 alteration, while it affords the means of moderating the heat 



