542 Tiin riiACTicAL gardener. 



necessity of a circulation. So far Mr. Bacon had a share in 

 the introduction of this useful plan, tliat he readily entered 

 into tlic merits of the hot-water system, and has the credit of 

 being the first in whose garden it was put into practice. 



Mr. Atkinson had proposed the heating by hot water to one 

 or two of his friends, for whom he was building hot-houses at 

 the time, but they considered the thing as speculative, and 

 declined it. He, moreover, offered to heat one of the houses 

 of a certain public garden by the same means, but the cautious 

 managers declined running any risk. They have, however, 

 since adopted the very same plan, which they should, out of 

 justice to their respectable fellow-member, the inventor, have 

 been the first to accede to. 



It has been stated, that a circulation is capable of being 

 carried on in one pipe, upon the supposition that the hottest 

 portion of the water will flow along the upper part of the tube, 

 while the colder portion will return below it to the boiler ; but 

 this has not been found to act in practice. 



By means of one pipe, water may be made the vehicle of 

 heating to a certain degree, but only by having the tops of 

 both the boiler and reservoir closely fixed down, and consti- 

 tuting, in fiict, a vessel in one piece ; the boiler and reservoir 

 being connected by their being elongated in form by the con- 

 necting tube. 



Boilers with fixed tops depart from the simplicity of the 

 original mode, and in themselves are objectionable, inasmuch 

 as they have to be taken to pieces to have the deficiency of 

 water made up, which is lost ; and the diOiculty of getting 

 them cleaned, which is a point, if not attended to, that would 

 soon end in their bottoms being burnt out, by the sediment of 

 the water, however pure, forming an incrustation upon the 

 inner side of the bottom, by which the water is prevented from 

 touching it; and, at the same time, the fire acting upon the 

 opposite side, without the counteracting effects of the water 

 within, soon burns them out. 



Add to this, should steam at any time generate within, the 

 consequence may lead to accidents of a serious nature. All 

 horticultural machinery should be constructed upon the least 

 complicated plan possible. It would be a libel upon the intcl- 



