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OBSERVATIONS 



O N 



CONSTRUCTING A GREEN-HOUSE: 



. BY JOHN W. WAT KINS, Es^ 



THE building fliould be funk in the earth from two to four 



feet, in proportion to the fize of the houfe, and according to 



the nature of the foil ; as clay retains moifture, and of 



confequence produces damps, in fuch ground it Ihould not 



be fo deep. The height fhould not exceed tv/elve feet from 



the exterior ground, by v/hich it will be lefs expofed to high 



winds. The width ihould not exceed fixteen or eighteen feet, 



as the fun's rays are at that di fiance from the glafs very feeble. 



A fcuth front is well known to be the true one, but 



advantage ihould be taken of glailing as much of the eaftern 



end as poflible, for the benefit of the morning fun. TJie front 



fhould decline northward from a perpendicular with the 



horizon, fo as the angle made, thereby with the horizon, will 



at noon day in winter, bring the rays of the fun to flrike the 



glafs at right angles, and the roof fhould defcend the oppofite 



fide without a break. By this pofition of the roof and glafs, 



the rays of the fun are thrown upon every part of the infide 



of the houfe, and the whole becomes heated thereby 5 



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