452 Scientific Intelligence. 
reduction of selenous acid by sulphurous acid, collecting and dry- 
ing the precipitate and weighing it, another determination was 
made. e mean of five determinations, which agree well with 
each other, is 79°08. The authors, believing the latter determina- 
tion to have more weight, assign the atomic weight 79°08 to selen- 
ratus with the combustion tube, the other furnished with a quetsch- 
hahn, for drawing off the liquid within. The two tubes are held 
parallel and upright and form a U tube. By turning the meas 
ing tube down it may be filled with a potash solution. The 
combustion is proceeded with as usual, carbon dioxide evolved 
from hydro-sodium carbonate being used first to drive out the 
air. As the bubbles rise through the potassium hydrate, they are 
more and more perfectly absorbed. When this process is finished 
the substance is heated and the nitrogen is allowed to come ae 
Its temperature is noted, and, after making the level of the liqui 
he same in both tubes, its volume is read and reduced t 
Some careful observations on its physical properties. Its e 
hee is about 29°5°, so that the heat of the hand liquefies < 
hen liquid, it exhibits the phenomena of surfusion to a pine 
able degree. It has remained liquid for more than a month, t i 
sit eg being frequently broken and reunited again by a ore 
lade, in a room the temperature of which often fell below 
freezing point. Contact with a bit of solid gallium however, 
to glass. Only a few degrees below its fusing point, the me ted 
hard and remarkably tenacious; but it may be cut with a knife 
as aluminum may. “ It crystallizes with facility, oryotle eiae 
“i 58 
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