of Edinhurgh, Session 1882 - 83 . 
183 
Experiment. 
Mass. 
Kesistauce. 
1, 2, 3, 
1 
1 
3, 
1-0014 
1-027 
3, 
1-0017 
1-062 
9 
1-0023 
1-094 
3, 
1-0023 
1-122 
1, 
1-0024 
1-148 
2, 
1-0028 
1-169 
2, 
1-0037 
1-244 
1, 
1-0041 
1-303 
3, 
1-0045 
1-319 
2, 
1-0048 
1-381 
b 
1-0060 
1-494 
2, 
1-0062 
1-474 
1, 
1-0068 
1-499 
2, 
1-0068 
1-518 
2, 
1-0068 
1-518 
3, 
1-0068 
1-472 
Graphically represented, these points lie clustered j^retty closely 
round a straight line inclined to the axis, along which mass is 
measured at an angle wdiose tangent is ’955, hut this straight line 
does not pass through the origin. Hence it would appear that the 
resistance does not begin to grow so quickly, hut that from the point 
at which the mass has become •! per cent, greater than at first the 
increase of resistance is directly proportional to the increase of mass. 
The ratio of the masses of saturated and pure palladium agrees 
well with Dewar’s results. The ratio of the conductivities is almost 
exactly as 2 to 3, somewhat greater than that cited above. 
When the palladium so hydrogenised was used as one element of 
a simple cell, of which dilute sulphuric acid and platinum were the 
other elements, the electro-motive force, as measured on the Thomson 
quadrant electrometer, was found to vary very curiously in relation 
to the hydrogen charge. The results are given in the following 
table, the unit mass referring to the pure palladium as above. The 
second column is the difference of potential in volts between the 
palladium and platinum poles : — 
Mass. 
Electro-motive Force. 
1 
- -05 
1-0014 
+ -81 
1-0017 
+ •79 
1-0023 
+ •73 
1-0045 
+ •74 
1-0068 
+ •33 
