RICHARDS AND HEIMROD. — THE IMPROVED VOLTAMETER. 437 



eigliteeu results, iucluding three given in the last paper, are recorded 

 below : — 



TABLE XIII. 

 Comparison of Porous Cup with modified Lord Rayleigh Voltameter. 



The comparison of the deposits thus shows that when the anode is 

 wrapped in paper, the deposit is on the average greater by 0.041 per cent. 

 This average difference is smaller than that given in the previous paper, 

 but it is probably more accurate, because it comprehends so many deter- 



