Messrs. Wanklyn and Cooper on Hydrogen Gas. 433 



The gas employed in this experiment was a mixture of hy- 

 drogen and air, consisting of about 3 volumes of hydrogen 

 and 1 volume of air. 



It will be noted that at the beginning of the absorption the 

 rate is about 5 cubic centim. in twenty-four hours ; then 2*5 

 cubic centim., and lastly 1 cubic centim. The retardation 

 evidently depends upon the diminishing proportion of hy- 

 drogen in the gaseous mixture. 



The next experiment was made with a saturated solution of 

 neutral permanganate (containing 6*5 grams permanganate of 

 potash in 100 cubic centim. of solution) : — 



Volur 



ne of 



gas taken . 



, . 



. 79*4 cubic centim 



After 



absorption for 26 hours 



. 39-0 



?? 



33 



33 



53 



further 14 



;? 



. 27-4 



35 



53 



35 



33 



12 



33 



. 22-8 



;> 



55 



55 



53 



13 



)> 



. 20-8 



n 



33 



55 



33 



„ 24 



33 



. 19-8 



33 



33 



le gas 



consisted of: — 



















Vols. 











Hydrogen 



... 



. 75 











Air . . 





. 25 







100 



In this instance the surface of the permanganate solution 

 was enlarged by the employment of glass beads about 4 milli- 

 metres in diameter. 



In another experiment the details were : — 



)lume of gas taken . . . 



29*0 cubic centim. 



'ter absorption for 1 hour . 



25-8 



33 55 



„ further 16 hours . 



10-4 



55 55 



33 93 9 » 



6-2 



55 55 



33 » 1^ JJ 



5-2 



55 55 



55 33 21 „ 



5-0 



35 53 



The solution of permanganate was the same as before, and 



the glass beads were used. 



