167 
These interesting results were confirmed by observing 
amalgams of tin, zinc, bismuth, copper, lead, and silver, and 
applying the source of beat 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 Avhen the heat is applied at one end of a horizontal 
column ; and they have obtained the following interesting 
series of results. 
Found. Calculated. Found. Calculated. 
Pure mercury ... . 2P63 679 
Mercury with two 
per cent of 
Silver 2-30 21 -81 72 684 
Tin 5-65 2P43 177 672 
Copper 13-19 21 -62 413 678 
Gold 14-50 21-79 454 680 
Bismuth 18"75 .... 21 - 20 .... 588 .... 664 
Lead 19-25 2P34 603 668 
Cadmium 20"20 .... 2 1 "51 .... 633 .... 676 
Zinc 21-20 .... 21-56 664 676 
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 
