106 
ANALYSIS  OF  A  CHALYBEATE  WATER. 
grs.,  lime,  26-2617  grs.,  magnesia,  84434  grs.,  sesquioxide  of 
iron,  0-791  grs.,  soda,  1.6389  grs.,  potassa,  a  trace.  No  chlo- 
rine, arsenic  or  any  other  heavy  metal  besides  the  little  iron  was 
found. 
From  these  results  the  following  quantities  of  anhydrous  salts 
are  calculated  : 
Bicarbonate  of  magnesia. 
15.1148 
grains. 
Sulphate  of  lime. 
63-8024 
Sulphate  of  magnesia,  . 
8-1546 
Protosulphate  of  iron,  . 
1-4040 
u 
Sulphate  of  soda, 
3-7401 
u 
Sulphate  of  potassa, 
trace. 
Inorganic  contents,  . 
92-2159 
a 
Organic  matter, 
28-48 
120-6959 
By  direct  evaporation  at  240°  F.,  119-26 
Sulph-liydric  acid  gas,     .      0-7702  cubic  inches. 
The  estimate  of  organic  matter  is  the  moan  of  two  experiments 
closely  agreeing  in  result ;  it  was  free  of  aproerenic  and  crenic 
acids.  After  evaporation  and  drying  the  residue  at  240^  F.  one 
half  of  the  carbonic  acid  had  been  evolved,  and  the  remainder 
was  in  combination  with  lime.  Deducting  the  expelled  acid  and 
adding  one  equivalent  of  water  retained  by  the  sulphates  of 
magnesia  and  iron  at  this  temperature,  the  residue  ought  to  have 
weighed  119-2491  grains,  or  -0109  grs.  less  than  found. 
The  spring  must  contain  a  considerable  quantity  more  of  iron 
and  sulphuric  acid,  but  whether  it  is  free  of  carbonic  acid,  can- 
not be  deduced  from  my  investigations,  which,  if  no  sulphuretted 
hydrogen  had  been  lost  by  previous  exposure,  would  on  the  con- 
trary necessitate  its  presence.  The  analysis,  however,  shows, 
that  the  water,  after  its  true  natural  constitution  shall  have  been 
ascertained,  may  take  its  place  probably  among  the  best  chaly- 
beate springs  of  this  or  the  European  continent. 
Philadelphia^  January,  1861. 
