MR. GEORGE GORE ON FLUORIDE OF SILVER. 
245 
consequence of the boat and outer end of the retort having been heated to redness 
before disconnecting them from the receiver. The saline residue weighed 161T7 
grains=a gain of 7'S7 grains=16’93 grains, or 362’8 cub. centims. of effective chlorine. 
After heating the boat to just below redness for half an hour in a nearly closed platinum 
retort, it was found to weigh T63 grain less than after heating to redness immediately 
before the experiment. The results are substantially the same as those of the last expe- 
riment, and may be explained in a similar manner. 
In another experiment made for the purpose of collecting some of the gas, the same 
boat, containing 177 - 2 grains of the fused fluoride, was employed, and the retort was 
heated 2^- hours. About 156‘4 cub. centims. of gas was found*, and the properties of 
the gas were the same as those previously found. Three separate small portions of it 
were mixed with an equal volume of hydrogen in one instance, and with twice its volume 
in the other instances, and a light applied ; combustion only, without explosion, took 
place, hydrofluoric acid was formed, and the glass became corroded on the entrance of 
atmospheric air. The gas therefore was not free fluorine. The odour of the gas was 
the same as that observed in other experiments in which fluoride of carbon was formed 
by different reactions. 
* The true volume of gas could not be accurately determined in these experiments on account of its absorp- 
tion by the carbon boat, and also on account of the opacity of the receiver. 
2 K 
MDCCCLXX, 
