If now the value of the second metal relative to the above value 

 of the first be taken equal to 1, the values of the others, in relation 

 to these, become constants, and only depend on the nature of each 

 metal ; these values I will call the Thermo-electric Constants. The 

 results obtained are given in the following Table, where the thermo- 

 electric constant of chemically pure silver is taken = 0, and that of 

 a certain commercial sort of copper = 1 . 



Bismuth (commercial, pressed wire) -f 35*81 



Bismuth (pure, pressed wire) + 32*91 



Alloy of 32 parts of bismuth and 1 part of antimony (cast) + 29 "06 



Bismuth (pure, cast) + 24*96 



Bismuth (crystal, axial) + 24-59 



Bismuth (crystal, equatorial) +17*17 



Cobalt No. 1 (a pressed specimen prepared by Professor 



Duflos, and out of the Collection of the Heidelberg 



Chemical Laboratory) +8*977 



Potassium (the same as used for the determination of its 



electric conducting powers for different temperatures) + 5 '4 9 2 



Argentine (wire of commerce, hard) +5'240 



Nickel (commercial, free from cobalt, but containing 



iron, &c.) +5'020 



Cobalt No. 2 (from the Collection of the Heidelberg 



Chemical Laboratory) +3748 



Palladium (wire, hard, from Desmoutis, Chapuis and Co. 



of Paris) +3-560 



Sodium (the same as used for the determination of its 



electric conducting powers for different temperatures) +3*094 



Quicksilver (pure, fused in a glass tube) + 2*524 



Aluminium (from Rousseau freres of Paris, wire-drawn, 



analysed by Dr. G. C. Caldwell, and found to contain 



Si 2-34, Fe 5*89, and Al 91*77) +1-283 



Magnesium (wire, pressed) , + 1 1 75 



Lead (pure, pressed wire) + 1 *029 



Tin (pure, pressed wire) +1*000 



Copper No. 1 (wire of commerce annealed, containing 



appreciable quantities of zinc, tin, lead and nickel) . . +1*000 



Copper No. 2 (wire of commerce annealed) +0*922 



Platinum (wire from Desmoutis, Chapuis and Co. of Paris) + 0*723 



