EICHARDS AND LEWIS. ZINC AND CADMIUM AMALGAMS. 99 



(4) The heat of amalgamation of cadmium is thus found to be +505 

 gram calories. 



(5) The heat of amalgamation of zinc as thus found is — 2255 gram 

 calories. 



(6) A solid electrode composed of finely divided electrolyzed metal 

 gives a very constant and reliable potential. 



(7) In the case of cadmium the contact-potential given by the satu- 

 rated amalgam in reversible relation to an electrolyte differs by the 

 twentieth of a volt from that given by the metal. 



(8) In the case of zinc this difference is very slight. 



Cambridge, Mass., October, 1898. 



