DIFFUSION OF HYDROCYANIC ACID VAPOR 197 
the cyanide. Thus, of the total amount of hydro- 
cyanic acid about 5 percent. remains in the generator, 
88 per cent. is diffused, and 7 per cent. must be 
charged to leakage or surface condensation on the 
walls of the room. In the experiments with the box 
it was estimated that only 68 per cent. of the total 
hydrocyanic vapor is actually efficient, the remainder 
being lost in the ways suggested. This greater loss 
with the smaller box is just what we should expect, 
for the relative amount of wall surface as compared 
with the cubic contents is much greater.”’ 
