192  ME.  G.  GOEE  ON  THE  PEOPEETIES  OE  ELECTEO-DEPOSITED  ANTEMONT. 
disc  of  thin  brass,  1|-  inch  diameter,  in  the  solution  of  tartar-emetic  and  chloride  of  anti- 
mony, at  a speed  of  3500  revolutions  per  minute  for  thu’ty-three  minutes,  and  simulta- 
neously passing  a current  from  five  zinc  and  silver  batteries  through  it  by  means  of  a 
disc  of  antimony  2|-  inches  diameter,  a scaly  deposit  of  bright  black  metal  was  obtained, 
possessing  the  usual  thermic  property. 
33.  In  every  case  where  the  deposited  metal  was  dark  and  shining,  it  evolved  heat  by 
the  exciting  causes,  and  under  the  conditions  named ; and  in  eveiy  case  where  it  was 
grey  and  crystalline,  it  would  not  evolve  heat. 
34.  The  physical  properties  of  the  metal  appear  to  be  closely  connected  Avith  the 
condition  of  the  liquid ; for  in  every  case  where  the  latter  was  sufficiently  changed,  whe- 
ther by  alteration  of  chemical  composition,  of  density,  of  temperature,  or  of  the  electric 
power,  a change  occurred  in  the  colour  and  brightness  of  the  deposit ; at  the  same  time, 
by  experimentally  examining  the  influence  of  each  of  these  circumstances  separately,  I 
did  not  find  the  peculiar  state  of  the  metal  to  be  invariably  connected  with  any  one  of 
them. 
35.  On  immersing  a piece  of  the  unchanged  metal  in  mercury,  and  apphfing  heat 
very  gradually,  it  suddenly  changed  with  great  force  at  a temperature  of  about  250° 
Fare. 
36.  A deposit,  consisting  of  2 79 ’5  grains  of  amorphous  antimony  and  101 '5  grains 
of  the  grey  variety,  was  formed  upon  a spherical  bulb  of  a thermometer,  and  after  well 
washing  and  drying,  was  wrapped  in  cotton-wool  and  touched  with  a small  heated  wire ; 
it  at  once  changed,  and  the  mercury  rose  from  75°‘2  Fare,  to  275°'2  Fare,  in  twenty- 
eight  seconds.  The  diameter  of  the  glass  bulb  was  ^ of  an  inch. 
37.  A second  deposit,  consisting  of  504'49  grains  of  dark  antimony,  formed  upon  the 
same  bulb,  and  treated  in  a similar  manner,  raised  the  temperature  of  the  mercury  ffiom 
75°  Fare,  to  445°-0  Fare,  in  one  minute  forty  seconds.  The  thickness  of  the  layer  of 
metal  was  |th  of  an  inch,  and  by  the  great  heat  evolved  it  acquired  a dull  grey  aspect, 
similar  to  the  grey  variety. 
38.  A cylindrical  bar  of  the  amorphous  metal,  about  ^ an  inch  in  diameter,  formed 
upon  a rod  of  grain  tin  |^th  of  an  inch  thick,  when  changed  by  the  momentary  applica- 
tion of  a heated  wue,  evolved  sufficient  heat  to  melt  the  tin  completely,  which  ran  out 
through  a crack  in  the  antimony,  and  remained  fluid  a short  time.  A bar  of  bismuth, 
-j^ths  of  an  inch  thick,  coated  to  about  fths  of  an  inch  in  diameter,  did  not  melt  by 
the  change. 
39.  By  immersing  a perfect  bar  of  the  dark  variety,  weighing  456'9  grains,  in  836'6 
grains  of  distilled  water,  contained  in  a large  thin  glass  tube  wrapped  in  cotton-wool, 
immersing  the  bulb  of  a thermometer  in  the  water,  and  allowing  the  whole  to  acquue  a 
uniform  temperature,  then  inducing  the  change  by  momentary  contact  of  a heated  wire, 
and  stu’ring  the  water  to  render  it  uniform,  the  temperature  of  the  water  rose  from  63° 
to  82°  Fare.  The  cooling  influence  of  the  water,  in  this  and  in  several  similar  experi- 
ments, appeared  to  prevent  the  metal  undergoing  its  full  amount  of  change. 
