Action  of  Metals  and  Liquids. 
57 
Crystallized  Boracic  Acid. 
The  hot  plate  was  positive.  A  series  of  six  solutions  was  em- 
ployed, containing  from  50  grains  to  nearly  400  grains  in  20  ounces 
by  measure  of  water,  the  strongest  being  a  saturated  solution.  The 
currents  obtained  were  extremely  feeble,  and  the  plates  were  not  tar- 
nished. 
Aqueous  Hydrojluosilicic  Acid. 
Value  of  deflection  •  1488.  The  hot  plate  was  negative,  and  became 
a  little  tarnished. 
Pure  Sulphuric  Acid. 
Ounces  of  strong  acid  Value  of 
The  hot  plate  was 
.negative,     and     the 
"plates  were  but  little 
tarnished. 
No. 
diluted  to  20 
ozs. 
Deflection. 
1.     . 
•  •  •       TT 
.... 
•0077^| 
2.     . 
\_ 
•0161 
3.     . 
'.'.'.        1 
.  .  •  • 
•0418 
4.     . 
l 
.  .  »           g 
.... 
•0878 
5.     . 
...           1 
.... 
•1044  ' 
6.     . 
...      2 
.... 
•0327 
7.     . 
...      4 
.    .    a    . 
•0037 
8.     . 
...      8 
.... 
•0319J 
Pure 
Phosphoric 
Acid,  solid. 
Gr 
ains  of  the  glacial  acid 
Value  of 
No. 
diluted  to  20 
ozs. 
Deflection. 
1.     . 
. . .        100 
Mil 
•C0005] 
2.     . 
...       200 
.... 
•00005 
3.     . 
...       400 
.... 
•00040  } 
4.     . 
...       800 
.... 
•C0060 
5.     . 
. . .     1600 
.... 
•00370 
The  hot  plate  was 
positive,      and     the 
r  plates  were  not  vi- 
sibly tarnished. 
Chloride  of  Copper  (Basic;  solution  filtered). 
Grains  of  the  salt  Value  of 
No.        diluted  to  12  ozs.  Deflection. 
1 100  ....  -0025    Hot  copper  positive. 
2 500  ....  -0198) 
3 1000  ....  -0025  f  »  negative. 
Much  action  on  both  plates,  especially  the  hot  one,  and  basic 
chloride  of  copper  formed. 
Chlorate  of  Copper. 
In  a  moderately  strong  solution  of  this  salt,  which  had  been  di- 
gested with  an  excess  of  carbonate  of  copper  and  filtered,  the  hot 
plate  was  negative  ;  value  of  deflection  *2997.  Both  plates  were  acted 
upon,  but  the  hot  one  the  most.  The  liquid  had  a  feebly  acid 
reaction. 
Sulphate  of  Copper. 
Grains  diluted  Value  of 
No.  to  20  ozs.  Deflection. 
1 249-5  ....  -0016    Hot  copper  negative, 
2 4990  ....  -0081    Liquid  acid. 
