314 Proceedings of Royal Society of Edinburgh. [sess. 
As regards the inclination of the cobalt line, the present result 
agrees as well with the earlier result as could reasonably be ex- 
pected with two quite different specimens of the metal. Thus, 
expressed in the same units, the thermoelectric power of Tait’s 
electrolytically-deposited cobalt is 
-26-3-0T16*, 
while for the present specimen 
p= — 13*2 - 0*139£ . 
With the exception of the sharp upward bend in nickel, this 
gives the greatest inclination yet obtained for a thermoelectric 
line. 
The downward trend and comparatively large inclination of the 
bismuth line are also worthy of note. Because of the position of 
the line, as a whole, lying far below the lines of all other metals, 
this large inclination does not greatly influence the electromotive 
forces, so that with bismuth couples the electromotive force is very 
approximately proportional to the temperature. This fact, of 
course, prevents us from making a very accurate determination of 
the coefficient B, which in the present experiment has a large pro- 
bable error. The mean value is a little larger than that indicated 
by Battelli’s direct measurements of the Thomson effect in bis- 
muth.* 
Righi has shown f that the electric resistance of bismuth is 
altered in a strong magnetic field. To find if any thermoelectric 
change accompanied magnetisation of bismuth, a bismuth palladium 
couple was set up between the poles of a powerful electromagnet. 
No effect whatever was observed, although the arrangement (slightly 
modified) was sensitive enough to show with great ease the thermo- 
magnetic effect discovered by v. Ettingshausen and Nernst.J 
* See Wied. Beibl., vol. xi., 1887. t See Wied. Beibl., vol, viii., 1884. 
| See Wied. Ann., vol. xxix., 1886. 
