of Edinburgh, Session 1882-83. 
181 
The graphical representation of these numbers gives a good curve, 
giving 1*23 for the density of the solution of least resistance. 
The specific resistances given by these experiments are all con- 
siderably too high, and the more so the greater the difference of 
potential between the points. I think it highly probable, however, 
that with a longer liquid . column, and a stronger current, more 
accurate values would be obtained. 
3. The Electrical Eesistance of Hydrogenised Palladium. 
By Cargill G. Knott, D.Sc., F.E.S.E. 
That the electrical resistance of palladium is increased by 
hydrogenisation has long been known, but the lack of any very 
definite information induced me to investigate the matter last 
winter. 
In one of Graham’s papers in Poggendorffs Annalen for 1869, 
it is stated that the conductivities of the pure palladium and the 
hydrogen-charged palladium are as 5*99 to 8 TO. Professor Dewar, in 
a paper in Trans. Roy. Soc. Edin., vol. xxvii., gives the further fact 
