1889 - 90 .] Mr Robert L. Mond on Electrolytic Conduction. 303 
This curve shows that only the first few points obtained show 
any rapid rise in current strength, the curve tending to become 
parallel to axis of abscissae, which it does when the plate is re- 
moved. 
In order to more fully elucidate the first points on this curve, 
three plates, of 1 sq. cm. each, were interposed instead of one, the 
storage cells being used, arranged in the previous manner, the 
results for 10 holes being embodied in curve (B), the deflections 
being those of Sir William Thomson’s Reflecting Galvanometer of 
22-3 B.A. units resistance, shunted through a resistance of 1 ohm. 
Since the mechanical disturbance due to the liberation of gas 
bubbles vitiated the results obtained, the experiment was repeated 
with the current from two Bunsen cells whose E. M. F. was about 
1*8 volt each; the size of the plates remaining the same, the results 
for nine holes in each plate are plotted in curve (C). 
For the first two holes in the plates the curve is practically a 
straight line, a great part of the current still passing through the 
platinum; for the next three holes we observe the transition period, 
and after that the whole of the current flows through the holes, the 
current slowly and regularly increasing in strength as the cross- 
section of the liquid passing through the holes is increased. 
This experiment was repeated under the same conditions with 
much larger plates (having an effective area of 24 compared to 6 sq. 
cm.). The curve (D) did not give very satisfactory results, it very 
quickly becoming a straight line. 
The experimental difficulties were greater than at first suspected, 
especially in finding a means for firmly securing the platinum. This 
was finally achieved by making the whole cell out of a block of 
paraffin, the platinum being firmly imbedded along the edges in the 
latter. Great care had also to be taken to keep the surface of the 
platinum clean and to ensure the electrolyte passing through the 
holes when made. 
In conclusion, I must express my best thanks to Professor Tait 
for his advice and the facilities placed at my disposal during these 
and other experiments; likewise to Dr Peddie, for the interest he 
has taken in my work. 
