ON ELECTROLYSIS IN ITS PHYSICAL AND CHEMICAL BEARINGS. 407 



Fig. 12. 



Averao-e difference of potential betioeen electrodes, 50"15 voltsi 

 Length of tube, 40'7 cm. Diameter, 0'393 cm. 

 Current from 5 to 2"7 milliamperes. 

 The X in the above relates to a possible contraction of the contents of cathode 

 vessel, to be determined later. 



August 10. — Another simi- 

 lar experiment with same 

 tube. Result sketched in 

 fig. 12. 

 Time taken for ring- to form, 



8 hours. 

 Distance travelled by Ba 37"3. 

 Distance travelled by SO4 3-55. 

 Difference of potential, 484. 

 Current from 4 to 1'5 milliamperes. 



Blank experiment with no current on, to see the e^ect of diffusion. 

 August 12. — Tube connected at x. 30. No ring formed, but by August 17, xiv. 30, 

 a slight precipitate was forming in the centre of the tube, i.e., after 5 days 4 hours. 



Experiment on the travelling of hydrogen. 

 August 17. — The same apparatus as in fig. 10 was again used, but the solutions 

 arranged as follows : — In cathode vessel, sat. solution of CUSO4 as before ; in anode 



IG. 13. 



(SO'i) (H) 



I (currenlr) -< 



or' 



xni.51. 



Sm. 56. 



srar. 6. 



xwir. 16. 



xvm. 26. 



XFDI. 36. 



xsm. 46. 



'SSW. 56. 



xix.e , 



SK. 16 . 



vessel, dilute sulphuric acid ; in tube, the following : 49 cc. of sodic chloride sol. 



