668 



An economical Green-house, 



which, by receiving the winter sun's rays at nearly right angles 

 (if I may so express it), warms the atmosphere of the house 

 considerably at that season when his animating influence 

 should be made the most of; the sloping front and ends cause 

 a very trifling additional expense, and in a house 20 ft. by 14 

 affords room for 300 pots 4 in. in diameter more than if those 

 lights were upright ; and under the projection outside is a snug 

 winter repository for half-hardy plants, &c, plunged in tan ; 

 in short, where economy is a consideration, such a house will 

 be found to answer the purpose admirably. Eight years ago 

 I had also a green-house erected, the draught of the chimney 

 of which was not sufficient to carry off the smoke, notwith- 

 standing I had it raised and altered in various ways ; and 

 conceiving at last that height had little to do with it, I deter- 

 mined to try what virtue there was in garden pots. I had the 

 chimney lowered considerably, took a pot about 14 in. in 

 diameter, knocked the bottom out, and had it firmly cemented 

 invertedly on the top, over which I put a second of a smaller 

 size, and also a third. {Jig. 128. a) The smoke then issued freely 



128 



from the top, occasioned by the current of air that passed up- 

 wards through the cavities between the pots, on account of 

 their not being quite circular, irregular ones having been 

 purposely selected. Indeed, it has answered the purpose 

 extremely well ever since, and to gardeners it is a cheap and 

 efficacious remedy always at hand : but, perhaps, they would 

 have more confidence in trying the experiment, if I refer them 

 to a much later though more scientific invention described in 

 part li. of the Mechanic's Magazine. 



I am, Sir, &c. 

 Hereford, January, 1830. Wm. Godsall. 



