474  Gleanings  from  the  German  Journals.  { AmbJc0tu>r'If78arm' 
Solubility  of  Silver  Nitrate. — The  following  tables  give  the  result 
of  J.  M.  Eder's  investigations  : 
IOO  parts  by  weight  of  Alcohol  dissolve  : 
Tempera-      Spec  grav. 
ture.           ofalcohol    0  815  0  863  0899  0*912  0  933  0*951  0*964  0*975  0  986 
Volumetric 
per  cent.      95  80       70       60  50       40       30      20  10 
At  i5°C.   "I  Parts,  by  (   3  8  10*3    22  1    30*5  35*8      56*4    73*7    107  158 
At  50        V  weight,  of  -j    7*3                       58*1  98*3  214 
At  75        J    nit.  ofsilv.  (18*3  42                89  160  340 
100  cc.  of  Alcoholic  Solutions,  of  Different  Specific  Gravity,  contain : 
Per  cent,  of  alcohol :  95.    So*    70*  60  •    50'      40*    30*    20*  10 
Grams  of  nitrate  of  silver  at  i5°C.=  3*      8*6  21*  27*1  33*4    52*8  6o*6  89*1  130 
75      =12*5  33*6        51*  108* 
On  cooling,  the  nitrate  crystallizes  in  handsome  thin  tablets.  It  is 
sparingly  soluble  in  pure  ether,  but  100  parts  of  water  saturated  with 
ether  dissolve  88  4  parts  by  weight  of  the  nitrate  at  I5°C. 
The  presence  of  sulphates  of  alkalies  slightly  increases  the  solubi- 
lity of  sulphate  of  silver  in  water. — Schw .  Wochenschr.,  June  7,  p.  202, 
from  Journ.f  Pract.  Chem. 
A  quantitative  analysis  of  genuine  Karlsbad  Sprudel  Salt 
proved  it  to  consist  of  98  per  cent,  of  sulphate  of  sodium  and  2  per 
cent,  of  sulphate  of  potassium,  thus  differing  from  the  constituents  of 
the  artificial  salt,  which  are  sulphate  of  sodium,  chloride  of  sodium  and 
carbonate  of  sodium.  Dr.  Uloth,  after  calling  attention  to  the  absence 
of  sulphate  of  potassium  in  some  lots  of  the  genuine  salt,  suggests  and 
recommends  the  following  formula  for  imitating  it: 
Dry  sulphate  of  sodium,  .  .  .  -45  parts 
bicarbonate  of  sodium,  .  .  33 
chloride  of  sodium,  .  .  .  .20 
sulphate  of  potassium,  ...  2 
Four  grams  of  the  resulting  salt  dissolved  in  J  liter  of  warm  water 
corresponds  in  strength  to  Karlsbad  water. — Pharm.  Ztg.,  July  3, 
p.  460. 
Tests  for  Glucose. — Pellet's  solution  consists  of  687  grams  crys- 
tallized sulphate  of  copper,  200*0  grams  chloride  of  sodium,  ioo*o 
anhydrous  carbonate  of  sodium  and  6*87  grams  chloride  of  ammonium 
dissolved  in  hot  water  and  diluted  to  1  liter.  10  cc.  of  this  liquid  cor- 
respond to  0*05  gram  of  glucose. 
Sacchsse's  solution  of  mercury  consists  of  1 8*0  grams  dry  iodide  of  mer- 
