272 ON HEATING PLANT STRUCTURES. 



kinds, all of which possess the very distinctive perfumes the title indi- 

 cates, viz., P. rose-scented, lemon-scented, peppermint-scented, nutmeg- 

 scented, musk-scented, violet-scented, lavendar-scented, orange-scented, 

 and apple-scented. The flowers of some of these varieties were of fine 

 form and size too, and I have no doubt, if proper attention be given in 

 impregnating from superior .sorts, tliat a race of first-rate kinds, having 

 the fragrant properties of its parent could be produced. 



ON HEATING PLANT STRUCTURES. 



(^Continued from page 25%.') 



The following letter refers to the above subject, and appeared in the 

 Gardeners' Chronicle a short time previous to the preceding remarks 

 of Mr. Hazard's being inserted : — 



" ( To the Editor.) 

 " Sir, — I have been some time M'aiting Mr. Hazard's reply to 

 Mr. Meek's letter, which appeared on the 19th September. The 

 reason of his silence I am at a loss to conjecture, as he could, I am 

 convinced, easily prove that the ' icy winds' of a winter's niglit do not 

 affect his stove in any way to lower the temperature of the house. I 

 should not have made these remarks but from a conviction that it is 

 our duty, as practical men, to bear testimony to a system whicli, with 

 a little variation, is one you have so ably advocated in your colunuis 

 from time to time. With you it is known as Polmaise, but here as 

 ' Hazard's system of heating.' Wlien I first heard of Mr. Hazard's 

 improvements in M'arming horticultural buildings, in the year 1843, 

 both Mr. Mayes and myself were strongly opposed to the plan of 

 heating by hot air, as we thouglit, in the first place, it would not be 

 congenial to the growth of plants ; and, secondly, that no gardener 

 would be enabled to keep anything like an equal temperature in severe 

 weather by such a system, and in our minds we pitied those who were 

 about to adopt it ; indeed, we felt so fully confident it would not 

 answer, that whenever our opinion was required, we invariably recom- 

 mended the plan whicli we then considered the best, viz., hot water 

 either in tanks or passing through pipes within the house. Judge, 

 then, our surprise one frosty morning, in the winter 1844-45, when, 

 on visiting for the first time the stove-house at Somerset-house, 

 Clifton, heated by Mr. Hazard's patent apparatus, we found the 

 temperature at 70^, althougli the gardener assured us that he had not 

 touched tiie fire since seven o'clock the previous evening ; the plants 

 were in a most flourishing condition, and far superior in health to any 

 in the neighbourhood. Being desirous of thoroughly testing the 

 system, we repeatedly called, and also sent our foreman, and invariably 

 found a temperature of the house from 60° to 70° during the coldest 

 nights of that most severe winter. After this satisfactory result, we 

 were desirous of trying the system in our own establishment, and 

 having at that time a house heated by flues, we removed them, and 

 erected Mr. Hazard's patented apparatus, with its vapour appendage, 



