556 Summary View of the Progress of Gardening. 



a' 



With respect to the use of Joyce's stoves in warming plant- 

 structures, there can be no doubt that they may be employed 

 with perfect safety; an excess of carbonic acid gas being much 

 less injurious to plants than to animals; but, the expense of 

 charcoal being so much greater in this country, than that of any 

 other kind of fuel, such stoves can only be recommended for 

 plant-cabinets ; and there they ought always to be accompanied 

 by water, so as to communicate moisture to the atmosphere as 

 well as heat. lor this purpose, copper water basins are sold 

 along with the stoves. 



The conclusion to be drawn from the history of the stove up 

 to the present time appears to us to be, that it is a more safe, 

 neat, and economical apparatus for burning charcoal in apart- 

 ments, than any of those hitherto in use ; and that, if the charcoal 

 have been properly burned, and no more fuel be employed in a 

 room, than is necessary during a London winter to raise it to 

 the temperature of 60°, the whole of the products may be allowed 

 to escape into the apartment, without greater danger than attends 

 the use of several lamps in rooms containing several persons. 

 With the safety pipes for carrying off the products of combustion, 

 either common or prepared charcoal may be used ; but, in this 

 case, great part of the heat, perhaps one half, must necessarily 

 escape by the pipes out of the room. In no mode of employing 

 charcoal, however, can the ventilation be so good, or the atmos- 

 phere of the room so healthy, as when open fire-places are used. 



In the course of the summer of 1838, Mr. Joyce applied 

 charcoal in a copper stove, for the purpose of generating steam; 

 the steam-tube serving at once for circulating the steam, and 

 conveying away the products of combustion. The object of this 

 invention is to form a salutary heat for plant-houses. We have 

 given an account (p. 370.) of this apparatus and its action, as 

 examined by us in Mr. Joyce's own garden ; but here, as in most 

 other cases of the use of this stove for gardening purposes, the 

 expense is the greatest objection. Mr. Harper, since he became 

 sole proprietor of Mr. Joyce's patent, has also contrived a mode 

 of generating and circulating steam, and also of heating and cir- 

 culating water, by the application of Joyce's stove: and these ap- 

 paratuses he applies to culinary purposes, and also to the heating 

 of plant-houses. We have seen an apparatus of this sort erected 

 in Mr. Harper's own green-house, at Kensington, which has a 

 very neat appearance, and answers admirably, as far as the pro- 

 duction of a genial moist heat is the object in view. 



Dr. Arnott's stove is an invention, or rather perhaps an im- 

 provement on former inventions, of the merits of which there can 

 be no doubt. It is described in p. 302., though the engraving 

 there given does not exhibit a correct view of the proportions of 

 the different parts of the stove, as adopted by the manufacturers 



