1 02 Domestic Notices. — England. 



gether with a treatise on their use. Mr. Gauen has also invented a revolving 

 forcing-frame, of which an account will appear in our pages at the same 

 time. 



The application of solar concentration to generating heat appears capable 

 of being carried to an unlimited extent in forcing and maintaining artificial 

 climates. Had Dr. Anderson been alive, he would have been delighted to 

 recognise a principle by which his idea might be realised, of generating, or 

 collecting and storing up, in or near hot-houses, as much solar heat during 

 sunshine as would serve during night and dull weather. In our opinion, 

 Mr. Gauen's invention would effect this object, if applied to heat an immense 

 body of water, or gravel, or metal, surrounded by a non-conducting medium, 

 which would form the reservoir of heat ; and this heat might be drawn out 

 by means of a current of air passing through the body, in coils of metallic 

 tubes. This current of air, as well as the admission of external air to the 

 hot-house, might be regulated by Mr. Kewley's machine. {Encyc. of Gard., 

 § 1490.) : Indeed, Mr. Gauen's engine is the most ingenious gardening in- 

 vention which has appeared since that of Mr. Kewley. We should like to 

 see both applied to the heating and regulating of a hot-house constructed 

 on the polyprosopic principle (Encyc. of Gard., § 1610.), and wish we 

 could indulge the hope that some spirited individual would attempt such a 

 thing. A successful result would certainly be the ne plus ultra of hot-house 

 gardening. 



Truffles. — Some time in September last a friend of mine, a nephew 

 to Mr. Tully, confectioner of Bath, paid me a visit at this place. When 

 walking through the woods belonging to my employer, Colonel Kingscote, 

 he asked me if I had not found truffles about them ; I told him I had not 

 searched for them. This he wondered at, because the woods adjoining, 

 he said, were the places from whence they procured most of what they 

 used at Bath. He added, that if I would allow him to come the next 

 season, which he said would be September or October, 1827, he would bring 

 a dog and have a day's excursion ; in the mean time if I would accompany 

 him to those and other places, he would show me where and how to find 

 them. Anxious to be informed, I accepted his offer, and by the help of 

 his dog soon found several. The situation was indeed similar to the woods 

 of Kingscote, as also the soil they grew in. The woods are principally 

 beech, the soil rather stiff and stony. I hope to be successful in the 

 attempt I mean to make to cultivate the truffle, and then shall be most 

 happy to furnish something farther in the shape of information. — William 

 Boyce. Kingscote Gardens, Jidy 21. 



Rheum palmatum as Tart Rhubarb. — About fifty years ago the late Ge- 

 neral Manners, of Bloxholm in this county, on his return from Russia, 

 brought home seeds of the 7?heum palmatum. My father procured a few 

 plants of the gardener, and it has been cultivated in the garden 1 now pos- 

 sess ever since, and the stalks regularly used every year. I have tried the 

 R Rhaponticum and the undulatum, which are much cultivated in this 

 neighbourhood, but certainly the R. palmatum is preferred to either. — 

 R. Turner. Grantham, May 21. 1827. 



Passiflbra quadrangidans is frequently grafted upon P. casrulea in France, 

 and flowers and fruits the same year, sometimes on plants not higher than 

 eighteen inches. (Vallet aine' of Rouen.) Some amateurs about London, 

 among others Mr. Burnard of Holloway, have grafted various species of 

 Passiflora on P. casrulea with perfect success. 



Pelargonium tricolor, grafted on the top of tall stems of P. cucullatum or 

 zonale, forms very handsome heads, which keep in bloom all the summer. 

 Mr. Ingram has some fine specimens in the gardens of Frogmore. 



Six Pine-apples, of the New Providence kind, were cut on the 23d, 

 24th, and 25th ult., by William Crawshay, Esq., of Cyfartha Castle, Gla- 



