BETWEEN THE VISCOSITY OF LIQUIDS AND THEIR CHEMECAL NA.TURE. 415 
allowed for the tube of the condenser to be rinsed out, the distillate is collected in the 
clean and dry store bottle. A small quantity of liquid is allowed to collect, and the 
bottle is then rinsed out. After this process has been repeated three or four times, the 
bottle is allowed to fill up with the distillate, and if on examination with a lens, when 
the bottle is held up to the light, the liquid shows no trace of suspended matter, it 
is regarded as dust-free. If suspended matter is present the distillation is repeated. 
As a rule, by the use of this glass apparatus, one distillation of liquid, which has been 
distilled in the ordinary way, gives a sample free from dust. 
Fig. 3. 
A special piece of apparatus was made in order to introduce and withdraw liquid 
from the glischroraeter. The essential parts of the apparatus are seen in fig. 3. On 
one side of a mahogany stand, which is 75 centims. high and 17 centims. square, is 
fitted, by brass clips, a 20 cub. centim. pipette, A, which serves as an air reservoir. 
Connecting this pipette with a similar one containing mercury, is a short straight glass 
tube with a stop-cock, B, and a rubber tube. The mercury pipette can be hung upon 
either of the hooks C or D, and in this way the air in the reservoir can be put under 
increased or diminished pressure. 
Connected by a T-piece with the air reservoir, are the two vertical glass tubes, E 
and F, each provided with stop-cocks. One of these tubes can be joined by rubber 
tubing to the horizontal limb of a small T-piece, G, the vertical limb of which passes 
