360 



Mr. J. J. Hood on the Rate of 

 SH 2 in Hydrogen. Barometer, 765*3. 



Time, 

 minutes. 



Manometer- 

 reading, 

 millimetres, 

 n. 



Difference of 



pressures. 



n' —7i. 



Ratio, 



n' — n 







1 



2 



3 



4 



5 



7 



10 



15 



20 



25 



30 



40 



50 



60 



30 

 344 



367-2 



379-4 



389 



396-8 



408 



417-1 



424-7 



430-9 



433-5 



434-7 



436-7 



437-3 



437-7 



314 



23-2 



12-2 



9-6 



7'8 



11-2 



91 



7-6 



6-2 



2-6 



12 



•2 



•6 



•4 



•074 

 •526 



•787 

 •813 



Chlorine. — In performing the experiments with this gas, 

 after charging the absorption-vessel the whole apparatus was 

 covered over with a cloth, and the room kept darkened to 

 prevent any decomposition taking place by the action of dif- 

 fused light with any trace of moisture that might be present, 

 or combination with ihe free hydrogen to form hydric chloride. 

 After the gases had been allowed to stand twenty hours to 

 mix, the experiment was completed by the aid of feeble candle- 

 light. The gas was prepared from manganic dioxide pre- 

 viously boiled with dilute hydric chloride. 



The following tables show how much more rapidly this gas 

 is absorbed than the two previous ones in an atmosphere of 

 air ; in hydrogen the rate is not much different from that of 

 SH 2 under like conditions : — 



CI in Air. Barometer, 764*2. 



Time, 

 minutes. 



Manometer- 

 reading, 

 millimetres. 

 n. 



Difference of 



pressures. 



n' — n. 



Ratio. 



n"~n' 



n'—n 







1 



2 



3 



4 



5 



7 



10 



15 



20 



25 



30 



40 



50 



60 



30 

 271 

 343-8 

 374-8 

 388-5 

 396-2 

 403-1 

 408 

 415 

 419-1 

 422-9 

 425-9 

 428-5 

 429-8 

 431 



241 



72-8 



31 



13-7 

 7-7 

 6-9 

 4-9 

 7 



4-1 

 3-8 

 3 



2-6 

 1-3 

 1-2 



•302 

 •426 

 •442 

 •562 



