194  ME.  G.  GOEE  ON  THE  PEOPEETIES  OF  ELECTEO-DEPOSITED  ANTDIONT. 
thermo-positive  to  a large  lump  of  grey  metal.  And  in  a thii’d  trial,  a large  changed  bar 
was  positive  to  a bar  formed  by  melting  and  casting  deposited  antimony. 
45.  Both  the  grey,  the  changed,  and  the  unchanged  metal  acquired  a coating  of 
dendritic  crystals  of  silver  by  immersion  in  a solution  of  nitrate  of  silver. 
46.  The  following  are  some  determinations  of  the  specific  gravity  of  the  deposits: — 
Three  specimens  of  unchanged  antimony. 
No.  1.  5-739  at  70°  Fahe. 
No.  2.  5-924  at  62°  Fahe. 
No.  3.  5-944  at  62°  F.'tHE. 
Five  bars  of  unchanged  antimony. 
No.  4.  5-766  at  60°  Fahe. 
No.  5.  5-769  at  62°  Fahe. 
No.  6.  5-782  at  62°  Fahe. 
No.  7.  5-785  at  62°-5  Fahe. 
No.  8.  5-814  at  61°-5  Fahe. 
The  bar  No.  4 weighed  467-00  grains;  and  by  immersing  it  in  750  grains  of  distilled 
water  at  60°  Fahe.  and  inducing  the  change,  it  evolved  a little  chloride  of  antimony, 
and  acquired  a density  of  5-818  at  60°  Fahe.  The  bar  No.  7 weighed  456-9  grains,  and 
by  changing  it  in  836-6  grains  of  water  at  63°  Fahe.  (see  39.),  it  acquired  a density  of 
5- 862  at  62°-3  Fahe.  And  the  bar  No.  8,  changed  in  the  air,  acquired  a density  of 
6- 186  at  61°-5  Fahe. 
Four  specimens  of  changed  antimony. 
Ten  specimens  of  grey  antimony. 
No.  1. 
5-748  at  75°  Fahe. 
No. 
1. 
6-369  at  75°  Fahe. 
No.  2. 
5-818  at  60°  Fahe. 
No. 
2. 
6-444  at  72°  Fahe. 
No.  3. 
5-880  at  62°-5  Fahe. 
No. 
3. 
6-497  at  72°  Fahe. 
No.  4. 
6-029  at  64°  Fahe. 
No. 
4. 
6-522  at  75°  Fahe. 
No. 
5. 
6-557  at  75°  Fahe. 
No. 
6. 
6-616  at  72°  Fahe. 
No. 
7. 
6-616  at  75°  Fahe. 
No. 
8.  ■ 
6-662  at  75°  Fahe. 
No. 
9. 
6-671  at  75°  Fahe. 
No.  10. 
6-673  at  75°  Fahe. 
Nos.  1 and  2 of  the  grey  specimens  were  deposited  from  the  upper  part  of  the  solution, 
composed  of  tartar-emetic  and  dilute  hydrochloric  acid ; the  remainder  were  deposited 
from  the  tartaric  acid  liquid.  Nos.  9 and  10  being  formed  very  slowly.  The  greater  spe- 
cific gravity  of  the  crystalline  metal  appears  worthy  of  consideration  in  connexion  with 
similar  difierences  of  density  of  amorphous  and  crystalline  sulphide  of  antimony*. 
47.  The  densities  of  both  varieties  changed  to  that  of  ordinary  antimony  by  fusion ; 
several  specimens  were  fused  under  tersulphide  of  antimony,  also  under  cyanide  of 
potassium,  and  their  specific  gravities  were  as  follows: — 6-67;  6-694;  6-71  at  76°  Fahe.  ; 
6-75  at  73°  Fahe.  ; and  6-83  at  75°  Fahe. 
48.  1 have  endeavoured  to  determine  the  electro-chemical  equivalent,  or  equivalents, 
* Vide  Gmelin’s  Handbook,  vol.  iv.  p.  337-349.  Cavendish  Society. 
