254 



GARDEN MANAGEMENT. 



bottom-heat, over a border of seven feet wide, on each side. The north- 

 eastern extremity may be so arranged as to present a combination of 

 exotic ferns and orchids ; for which, by the aid of a water-tank, a per- 

 fectly congenial atmosphere may be supplied here ; and by building up the 

 further end of the house in rock-work, the whole width of the house, and 

 opening a communication with the tanks on each side, any amount of moisture 

 may be obtained j and by placing a concealed cistern above the level of the 



y. — SECTIOIT OF FOBCIXG-HOrSE AXD HOT-I'ITS. 



rock, and over the boiler, silvery streams of warm water may be made to 

 trickle over the tortuous track of rock-work, terminating, perhaps, in a 

 miniature water-fall, or supplying a miniature fountain under other arrange- 

 ments. 



6S7. Upright or side-lights, two feet high, run the entire length of each 

 house, and are made to open and shut by means of a I'od of iron, which runs 

 the whole length also. To this rod are attached shorter rods at intervals 

 of four or five feet, with 





XI.— VENTILATIIfG ArPABATTJS. 



joints; the other end of 

 the shorter rocc3 being at- 

 tached to the lights, both 

 ends of the short rod work- 

 ing on a joint. To one end of the long rod is fixed a long screw, 

 working in slings made to receive it. To this screw is attached a 

 grooved wheel, which is made to i-evolve in an endless chain, 

 acted upon by another grooved wheel, turned by a handle placed 

 in some convenient part of the house. By the action of the screw, 

 the long rod is drawn backwards or forwards, which acts upon the 

 short rods, and opens or shuts the light to any requii-ed point. The 

 same system of raising the lights may be appUed to one or more of the 

 lights, or to the whole, as may be necessary. 



688. The system of ventilation adopted by Mr, Messenger will be better 

 understood by reference to the diagram, in which BB are short rods, con- 

 nected with the sling A at one end, and the lights at the other. The dotted 

 lines, Df represent the upright divisions which support the roof ; E, the screw- 

 siirgs, in which the screw F is to work ; G is a grooved wheeLin which the 



