THE WALTONIAN CASE. 267 



entrance to the hot-air chamber, into which the flame of 

 the lamp enters when the case is at work. 



Replacing the tray, it will be seen that the hole in the 

 boiler fits over the box that contains the lamp. 



The flame of the lamp plays upon the inside tank, and 

 the smoke escapes by means of the flue G, which conducts 

 it out through the back of the case, quite away from the 

 plants. Practically speaking, there is but very little smoke. 



FIG. 3. 



The exact measurements of these several parts are in the 

 case above figured. Length of tray B B, thirty-four and 

 one-half inches ; breadth, seventeen inches. As the pots 

 stand inside the tray, and the latter fits the frame, there is, 

 therefore, a working space for plants of five hundred and 

 sixty square inches. Depth of the boiler A, two inches. 

 The entire case measures outside, along the front, thirty-six 

 inches and a half ; from back to front, eighteen inches and 

 a half, When placed at a window, or in a green-house, 

 light is admitted only at the top, but the case might be 

 made with lights at the back, and additional light would be 



