370 
DR.  A.  MATTHIESSEN  0^7  THE  THEEMO-ELECTEIC  SERIES. 
Bismuth  (crystal,  axial) +24 -SO 
Bismuth  (crystal,  equatorial) +17 ’IT 
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) + 5-492 
Argentine  (wire  of  commerce,  hard  drawn) + 5-240 
Nickel  (commercial,  free  from  cobalt,  but  containing  iron,  &c.)  (from 
Messrs.  Evans  and  Atkin,  Birmingham) +5-020 
Cobalt  No.  2 (from  the  Collection  of  the  Heidelberg  Laboratory")  . . . . +3-748 
Palladium  (wire,  hard  drawn,  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  Kousseau  Freres  of  Paris,  wire,  hard  drawn,  analysed  by 
Dr.  G.  C.  Caldwell,  and  found  to  contain  Si  2-34,  Fe  5-89,  and  A1  91-77)  + 1-283 
Magnesium  (wire,  pressed) +1-175 
Lead  (pure,  pressed  wire) + 1-029 
Tin  (pure,  pressed  wire).  The  difference  of  the  electromotive  powers  of 
the  elements  was  here  so  small  that  it  could  not  be  determined ; uuth 
the  galvanometer,  a copper-tin  element,  when  the  soldered  points  had 
100°  C.  difference,  gave  no  appreciable  deflection ; also  the  central 
experiments  show  as  well  how  very  little  the  electromotive  power  of 
a silver-tin  thermo-element  varies  from  a silver-copper  one  . . . . + 1-000 
Copper  No.  1 (wire  of  commerce,  annealed,  containing  small  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 
Gold  (wire,  hard  drawn,  purified  by  Dr.  C.  Meyboom) +0-613 
Iridium  (from  the  Collection  of  the  Heidelberg  Chemical  Laboratory)  . . +0-163 
Antimony  (wire,  pressed  specimens,  purified  by  Dr.  W.  P.  Dextee  and 
Dr.  G.  C.  Caldwell) + 0-036 
Silver  (pure,  drawn,  hard) 0-000 
Gas-coke  (from  the  Heidelberg  Gas-Manufactory,  the  hard  mass  remaining 
in  the  retorts) 0-057 
Zinc  (pure,  pressed) — 0-208 
Copper  (galvanoplastically  precipitated) — 0-244 
Cadmium  (a  pure  slip  of  foil  from  Professor  Bottger) — 0-332 
Antimony  (commercial,  pressed  wire)  ■ — 1*897 
Strontium  (pressed  wii-e) — 2-028 
Lithium  (pressed  wire)  — 3*708 
Arsenic  (a  piece,  pure) — 3*828 
