without fresh Supplies of Water and Air. 



483 



Elevation of one End of the Box (A) 

 and Cover (c). 



Cross Section of the Box and Cover. 



parts : the stand (Jig. 1 22. a), the box (&), and the glass roof, 

 or cover (c). The stand is 1 ft. 10 in. in height; the box, 8^ in.; 

 and the cover, 1 ft. 1\ in. ; making the total height 4 ft. 2 in. 

 The stand, on which the box rests, is made of mahogany, and 

 supported on four legs, furnished with movable casters. The 

 box contains the soil ; and is made of well-seasoned St. Domingo 



125 



Plan of the Box, showing the two Partitions {d d). 



mahogany, previously steeped for a fortnight in Kyan's preser- 

 vative composition. Its sides are \\ in. thick, mitred and dove- 

 tailed together at the corners. The bottom of the box is of 

 Honduras mahogany, 1 in. thick, and is formed of numerous 

 small pieces, framed and flush-paneled, and so arranged as best 

 to resist the yielding of the wood, in consequence of the mass of 

 moist earth which it has to bear. To give it greater strength, 

 two cross, or tie, pieces stretch from side to side, and are dove- 

 tailed into the sides: they are placed at equal distances from the 

 two ends, and thus divide the box into three compartments; but, as 



k it 2 



