167 



These interesting results were confirmed by observing 

 amalgams of tin, zinc, bismuth, copper, lead, and silver, and 

 applying the source of heat in all cases at the upper part of a 

 perpendicular column of the amalgam. 



The third part of their Paper has reference to the conducti- 

 bility of mercury when mixed with two per cent of various 

 metals, and when the heat is applied at one end of a horizontal 

 column ; and they have obtained the following interesting 

 series of results. 



Found. 



Pure mercury ... . 21*63 



Mercury with two 

 per cent of 



Silver 2-30 



Tin 5-65 



Copper 13-19 . 



Gold U-50 



Bismuth 18-75 



Lead 19-25 



Cadmium 20-20 . 



Zinc •. 21-20 



This table shows that the greater or less conducting power 

 of the metal amalgamated with it has no influence in modify- 

 ing the conductibility of the amalgam itself; for we find that 

 the amalgam of bismuth (the worst conducting metal) con- 

 ducts heat eight times better than that of silver (the best 

 conductor), for 



Mercury -\- 2 per cent of Bismuth 588 



+ 2 „ Silver 72 



They were induced to believe at the beginning of these 

 researches that the cause which impeded the conduction of 

 heat in so marked a manner in some of these amalgams was 

 the presence of small crystals of amalgam floating in excess 



