686 Calls at the Nurseries 



f, which was calculated to hold exactly the same quantity of water, was 

 filled and corked in like manner. Arrangements being then made for two 



121 



y 



2) 



/ 



persons to take out the four corks at the same instant of time, both vessels 

 were filled with water at a temperature of 150° at the same moment, and 

 the four corks were immediately taken out ; Mr. Westland standing at g, 

 with one hand on e, and the other on/. The heat arrived nuich sooner at 

 e than at /, and continued hotter for a greater length of time. The cir- 

 culation of both apparatus was allowed to go on till the water in both 

 vessels was cooled down to 60°, and it was found that the water in e was 

 much sooner cooled down to that temperature than the water in rf; we 

 shall not say how much sooner, because we wish this experiment to be 

 tried by Messrs. Cottam, Messrs. Walker, Messrs. Bailey, Mr. John Jones 

 of Birmingham, and other tradesmen, that are in the habit of heating by 

 hot water according to the ordinary modes. Mr. Westland having thus 

 convinced himself that Mr. Kewley's mode was superior to all others 

 hitherto brought into notice, in the two respects above mentioned, had only 

 to ascertain whether it was practicable to make the joints of the siphon 

 water-tight at a moderate expense, and to draw off' the air which neces- 

 sarily generates in the water, and rises to the highest point in the tubes. 

 The first point he was assured of by Mr. Kewley, who employs a cement 

 in general use among ironmongers j but the composition is mixed up by 

 them in proportions which very shortly give way, and leave a leaky joint. 

 The second point, it is well known to all who have seen Mr. Kewley's 

 apparatus, as put up at Mr. Colvill's, is effected in the most complete 

 manner by an air-pump. As to the expense of Mr. Kewley's system, the 

 general price is 7*. per foot of pipe, which includes the boiler, air-pump, 

 carriage, putting up, and all other expenses whatever. In extra-cases, 8*. 

 per foot is charged, but seldom or never more. Perhaps it may be thought 

 that we have some interest in recommending Mr. Kewley's mode of heat- 

 ing. Quite the contrary. We have been on terms of friendship with Mr. 

 Kewley for a dozen years past, and we know it to be his policy to keep all 

 his plans as much a secret as possible. We have given this notice of his 

 mode at the risk of giving him offence, simply because we conceive it to be 

 our duty, as Conductor of the Gardener's Magazine, to make our readers 

 fully aware of the advantages of that plan which we consider to be the 

 best. Let no one, however, attempt Kewley's plan who cannot make 

 water-tight joints. (See p. 376., and Vol. V. p. 543.) 



Sprateley's Nursery, and Bradley's Nursery, both at Dorhing, are worth 

 looking at ; and they add to the beauty and interest of this most delightful 

 neighbourhood. 



Goldworth Nursery, Mr. Donald, — Oct. 24. The arboretum is doing 

 well : there have been very iew deaths ; and, considering that many of the 

 plants were put in the ground in May, they have made surprising shoots. 

 The changing colour of the foliage of the American oaks, particularly 

 aquatica, palustris, and tinctoria, is now rich and beautiful in an extreme 

 degree. In another half century, such colours will be common in all our 

 plantations. For autumnal colour the oak is beyond all other trees. No 

 gentleman ought to plant fewer than thirty species, even if he should send to 

 America for them ; but Mr. Donald will soon have more than this number 



