558 Stammaiy View of the Progress of Gardening, 



tural philosophy, should yet be so far infatuated with his inven- 

 tion.. as, in hb publication describing the stove. On TVai-ming and 

 Ventilating, -xith Directions for making and using the Ther- 

 wutmeter Stove, reviewed p. 154., to argue in favour of so slight a 

 degree of ventilation, that it would be next to death to many 

 persons in this country to endure it. The merit of first having 

 pointed out these great errors in Dr. Arnott's otherwise very 

 ingenious work Is due to Mr. JeflVey, the inventor of the re- 

 spirator ; whose articles on the subject in the Medical Gazette 

 are, with that gentleman's permission, in great part copied into 

 the fifth volume of the Architectural Magazine. They are of 

 intense interest, and well deserving the perusal of all who seek 

 for information on the subject of ventilation. Dr. Arnott is at 

 present employed by government to warm the long room of the 

 London Custom Hou^, and we hope he will there introduce 

 some mode of ventilating as well as warming, which will be satis- 

 factorv to the public We have seen at the doctor's own house, 

 a model of an apparatus to be worked by clockwork, which will 

 act on the principle of Jeffrey's respirator, and which, if it does 

 not prove too expensive, promises to answer weD, even for small 

 rooms ; but we consider it unsafe to recommend this, or any 

 other apparatus, before having seen it in use for some time. 



Thus, then, the two principal inventions of 1 S38, applicable to 

 gardening, appear, when carefully examined, to be of but mo- 

 derate value with reference to that art, Joyce's stove, it can never 

 be worth while to employ in plant-houses, except very small ones, 

 because it will cost more than the ordinary modes of heating by 

 flues or hot water: and Arnott's stove can only be employed in 

 verv small green-houses, because its heating powers are of a very 

 limited nature, and by no means adequate to supply the waste of 

 heat from a large surface of glass, during a long and severe 

 winter's night. To fit it for this purpose, it must be made on a 

 verv large scale, or several stoves must be employed in the same 

 house; and to have recourse to either of these modes would be 

 found much more expensive than a system of smoke flues or hot- 

 water pipes. In the wanner parts of England, one of these stoves, 

 or of Jovce's, might be employed to keep out the frost from an 

 old-fashioned green-hoase or an orangery, with an opaque roof; 

 bat where there is a roof wholly of glass, we would by no means 

 recommend trusting to either of them. Any gardener who can 

 calculate how many superficial feet of hot-water pipe will be re- 

 qoired to beat a house, may easily calculate the number of super- 

 ficial feet of the iron casing of Dr. Arnott's stoves that will be 

 required for the same purpose : because the heat produced by 

 the two surfaces is, or ought to be, of about the same degree. 



We cannot reter to any remarkable feature, as characterising 

 the proceedings of any of our institutions for the promotion of 



