rg1r] BRIEFER ARTICLES 65 
ing the “capillary” and supply tube from the thistle tube and letting 
them hang downward from the supply bottle for a minute to expel all 
the air from them. 
Fic. 4.—Photograph showing supports: to the stem of the double burette 
clamp, which holds the mixing and dehydrating tubes, is attached a single clamp which 
holds the waste tube. 
Mathematical calculations, as well as numerous picnometer tests, 
show that the percentage of alcohol in C increases very steadily to about 
75 per cent. Calling the contents of C one volume, the picnometer 
tests show that two volumes of 95 per cent alcohol will raise the strength 
of that in C to 70 per cent, three volumes to 85 per cent, and four to 92 
