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I71proped oaefdod of Heating Ioases.-

 We find in the English Gardeners Ma gazine, tie annexed description of an improved method of heating hot hous- es. The inventor Is Mir. A. NJ. Per kins, d son of Mr. Jacob Perkins, the celebrated Ssteam eompeller,n who has won 50 much for the credit of Amcri- can invention and science in London.

 The improvement is a plan for heat ing hot houses by the circulation of hot water in dramatically sealed tubes, of small diameter. However favorable this plan may be for heating hot houses, the advantages for that class of struc- lures are as nothing compared with those which it offers for heating dwelling houses and all kinds of manufactures.

 Water may be circulated, under or dinary circumstances of attention 10 the fire at from 300 deg. to GOO. It is found that 400 degrees will roast meat. Mir. Perkins is constructing for himself an oven for roasting by water. This will lead to beneficial changes in domestic Water at 800 deg. or at least, water al 80 deg. for the pur, pose of cookery, and for heating reserve cisterns of cold water, or masses of met al or masonry, for various domestic pur- poses. including warming rooms, heat ing baths, laundries, &c. may at no dis tant time be circulated by companies, Tn the same manner IS gas; and in Lon don. instead of one fire for every room, as at present, there may be only one in a parish, or in every square of an acre in area.