g2 MANAGEMENT OF THE FORCING-HOUSE. 
uous watching was necessary to prevent the material 
from taking fire, for if this should occur it would prove 
almost instantly fatal to all the plants which might be 
reached by the gas. The difficulty was in a great measure 
_z overcome by L. C. Corbett, at that time 
an assistant at Cornell, who suggested the 
use of a sand-bath as a means of modifying 
the intensity of the heat. Our present out- 
fit is shown in Fig. 31. It consists of two 
pans placed on an ordinary hand oil-stove. 
The lower pan is half filled with clean, 
coarse sand, and the upper one contains the 
gt. Sulphur . 
PBS sulphur. By its proper use our houses have 
been kept remarkably free from mildew, 
even under very adverse circumstances. But there is 
constant danger that the sulphur will become heated to 
the burning point, and then the entire stock of plants in 
the house is lost. This use of sulphur is often very con- 
venient, but the work should be placed in the hands of 
a most trustworthy person. If a house should be thor- 
oughly treated in this manner every week or two, scarcely 
any mildew could develop. 
