72 
Scientific Proceedings (42). 
ary column of oil an inch high in the tube was visible above the 
protruding edge of the sheath. The tube and bag were then 
lowered into a salt mouth liter bottle on the table until the bag 
almost touched the bottom of the bottle. The height of the bottle 
and the length of the bag were nearly equal. The tube was then 
marked with a label on the plane of the oil meniscus just above 
the neck of the bag, and enough ether was poured into the bottle 
to provide immersion for the bag to the depth of an inch. For 
a moment no change in the volume of oil was apparent, and the 
lateral pressure of the ether was obviously without mechanical 
effect. But in a minute or two diffusion currents were visible 
along the surface of the bag and oil rose rapidly in the tube. 
After the initial effects of the ether had been shown, the bottle 
was filled with ether containing Sudan III, and a 5 -foot vertical 
extension of the same bore was added to the upright glass tube. 
In a moment the upward movement of the liquid was accelerated. 
The demonstration was started at about 9 p.m. At 10 p.m. the 
osmotic pressure had carried the column of oily fluid to the top 
of the 10-foot tube, and liquid continued to run rapidly from the 
upper orifice until the apparatus was dismantled after the adjourn- 
ment of the meeting, at about 11:30 p.m. 
During the progress of the demonstration, Sudan III diffused 
rapidly from the exterior, through the rubber, to the very top of 
the rising column of fluid, before any of the liquid passed out of 
the upper opening. Oil diffused rapidly through the rubber into 
the ether. 
The second demonstration was essentially the same in prin- 
ciple and technic as the first. Instead of a 10-foot upright tube, 
however, the authors substituted an L tube with an inside dia- 
meter of 6 mm. The vertical extension of the tube was 17 in., 
the horizontal extension was only 3 inches. The latter extension 
was drawn out to a narrow bore in an inclined plane, to facilitate 
direct delivery of any liquid that might pass through that end of 
the tube. 
When partial immersion of the bag first occurred there was no 
visible response, but, in a minute or two, oil began to rise in the 
tube. The bag was then completely covered with ether. The 
upward movement proceeded rapidly and in about an hour nearly 
