By the Rev. George Swayne. 



and with much less trouble and expense* than I could do in 

 the last, when the furnace was supposed to be continually in 

 action. At no time since last September has the fire been 

 lighted before eight o'clock in the morning, or continued after 

 eight in the evening. Nor is it my intention to alter this re- 

 gulation although the weather should become much colder 

 than it has hitherto been.f The glazed roof of my stove is 

 not puttied, and there is no tan in the pit, only a few common 

 leaves on the top of it, to the depth of the bottom of the pots, 

 the latter resting on a foundation of drift-sand and coal ashes. 



It may deserve to be noticed, that in a few minutes after 

 the current of air has been excluded from the flue in the 

 evening, the thermometer suspended in the middle of the 

 house begins to rise, and continues to do so, from twenty to 

 thirty minutes ; during which time it rises from one to three 

 degrees, after which, it becomes stationary for some time, and 

 then gradually subsides about one degree in an hour, till the 

 morning. When I leave the stove at eight o'clock in the 

 evening, it ususally stands at from 65° to 70°. In the morn- 

 ing at the same hour, I commonly find it from 55° to 60°. 

 Another good effect of the exclusion of the air from the flue, 

 is, that the latter, very soon afterwards, becomes nearly of an 

 equal temperature throughout, which is not the case whilst 

 the air is passing through it. 



* On my present plan, a quarter of an hundred of small coal suffices for the 

 consumption of the furnace during twenty-four hours, as I have ascertained by 

 weighing the quantity used in that space of time The eost of which estimated 

 according to the price of that article as stated by the President, « hi. Paper On 

 the most economical method I of employing fuel, Jc. (Hort. Trans. Vol. n page 



156,) amounts to no more than l|d, but 



f The thermometer out of doors, ( 



; rather think it costs me about double 



t 4° below freezing. 



