^56 gaede:< management. 



principle : the whole range is 26 feet wide, — supported by brick walls sunk 

 three feet under the ground-level. The hot pits are supplied with bottom- 

 heat by means of tanks and hot-water pipes, the lights being formed of the 

 ■ordinary sash -bars, glazed. 



694. The follovv-ing estimate Mr. I\Iessenger authorizes us to publish, as his 

 price for such a range of houses as we have described, assuming brick-work 

 ■and other material to be the same as in his own neighbourhood, and exclusive 

 of carriage ; but, of course, such an estimate can only be taken as an 

 ■approximate one in many of its details. 



Cost of Sections of range of Greenhouse, d:c. 

 whole of the brickwork, including floors, pit-walls, air- £. 

 drains, &c. . . . . . . . . . . . . . . . . 33 



The whole of wood-work required . . . . 59 



Glazing the whole with 15-oz. glass . . . , . . . . . . 23 



Painting both sides four times . . . . . . . . . . . . 14 



Patented Ventilating-apparatus . . . . . . . . . . 8 



,, Boiler, with furnace and setting complete, with stoke- 

 hole 13 



Hot-water pipes, bends, vapour-troughs, siphons, &c., and fixed 



complete 

 Slate tanks, and interior fittings for forcing-house , . 

 Stages and fittings for greenhouse 



£263 



695. Our space does not peniiit of these remarks being extended, nor is it 

 necessary, as few persons will be disposed to build hothouses without proper 

 plans and estimates, and we can only hope to be useful in pointing out some 

 of the neeessary steps to be taken. 



§ 3. — Warming and Ventilating. 



696. In no depai-tment of industrial art has more ingenuity been exercised 

 than in applying heat, whether it be to houses or horticultural buildings : 

 stoves, furnaces, and boilers, endless in form and principle, — hot air, hot water, 

 and steam, have, in turn, been adopted, approved, and superseded ; tubular 

 furnaces, tubular boilers, in an endless variety of forms, have been invented, 

 sometimes with most satisfactory, at other times with doubtful results ; and 

 we shall probably be approximating to the truth in stating that while all have 

 had, and have, their advocates in the gardening world, no mode of heating is 

 60 universally approved as hot water circulating in iron pipes, with bottom-heat 

 suppliel ircm tanks heated by the same means. Even to this cleanly and 

 convenient fonn of heating, however, there are objections : something is wanted 

 that shall simulate the ammonial gaseous qualities of the vapour arising 

 from hot dung, in which plants seem so to revel ; and various expedients are 

 adopted, by which this is partly attained. Mr. Fleming has introduced into tho 



