at Pendm'ves. Corivwalh 



419 



80 



In erecting these houses, particular atten- 

 tion has been paid to lightness, utility, and 

 economy. Two houses and one pit are 

 heated by hot water from one fireplace and 

 boiler, the pipes of which are of zinc. The 

 details of the plan and sections [^figs- 80. 

 to 83.) contain some improvements by Mr. 

 David MacClelland, clerk of the works, 

 who was sent here by Henry Harrison, Esq., 

 architect of London, the principle of which 

 may be easily understood, by inspecting the 

 section of the rafter in^5. 82. and 83. 



The bars of the lights are beveled in the 

 same way as the rafters, which adds con- 

 siderably to the lightness and neatness of 

 the whole. 



The lights are fixed, with the exception 

 of the lower ones, which are made to move, 

 for the purpose of taking out the vines. 



The ventilation is effected in the back 

 wall of the first two houses ; and the aper- 

 tures through which the air is admitted are 

 secured from the ingress of flies and wasps 

 by perforated zinc, which also breaks the 

 coldness of the current of air. 



In preparing the vine borders, I have put 

 in a large quantity of uncrushed bones, old 

 lime rubbish, and decayed weeds, with a 

 little dung from old hot-beds, well mixed 

 with the earth ; and in this compost I find 

 the vines grow remarkably strong. The 

 borders are from 20 in. to 2 ft. deep, on a 

 dry bottom. 



The first house [Jig- 81. A.) is intended 

 principally for grapes forced early in pots, 

 to be succeeded by those on the rafters ; and, by planting two 

 vines to each rafter, one on each side, and taking them in suc- 

 cessively one after the other, a regular succession of fruit may 

 be obtained. The second house {Jig. 81. g.^ is for the growth 

 of pines and grapes ; and in this house the vines trained to the 

 rafters will be kept close, so as not to shade the pines too much. 

 The back wall, and over the path, will be entirely covered with 

 vines, principally of the muscat varieties, and trained as recom- 

 mended by Mr. Hoare in his Treatise on the Vine. 



Several gentlemen, who have seen our houses, have recom- 

 mended me to send you a plan of them for publication in the Gar~ 



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