334  ARTESIAN  WATER  OF  CHARLESTON,  S.  C. 
draw  important  inferences  from  a  knowledge  of  its  composition, 
since  it  comes  up  from  below  the  layer  of  phosphatic  nodules 
(sixty  feet  from  the  surface),  but  also  travellers  and  health- 
seekers,  who  every  season  drink  at  this  agreeable  well,  which  is 
also  quite  popular  among  our  citizens. 
The  following  analysis  is  the  average  of  several,  completed  at 
intervals  of  a  few  weeks  during  last  winter  and  spring.  Slight, 
but  unmistakable,  changes  were  noticed  in  the  proportions  of 
some  of  the  ingredients  during  these  investigations.  There  are 
two  wells  ;  only  one,  however,  is  completed.  This,  the  old  one, 
is  about  1250  feet  deep.  The  temperature  of  the  water  at  the 
spout  is  87°  F.  (or  30-7°  C).  Specific  gravity  (taken  at  15° 
C),  is  1*0015.  The  amount  of  solid  ingredients  in  the  water== 
0-228— 0-234  per  cent. 
In  100  parts  solid  ingredients  : 
Bicarbonate  of  soda  .  .  .  52*749 
Chlorid  of  sodium  ....  47*051 
Bicarbonate  of  lime         .         .         .  0*0883 
Bicarbonate  of  magnesia  .  .  .  0*01375 
Silica   0*00102 
Phosphates  of  lime,  iron  and  alumina     .  0*0004 
Organic  matter     ....  0*0017 
Sulphuric  acid  in  traces. 
In  100  parts  well  water — 
Bicarbonate  of  soda         .  .  .  0*1435 
Chlorid  of  sodium  ....  0*128 
Bicarbonate  of  lime  .         .         .  0*000273 
Bicarbonate  of  magnesia  .         .         .  0*0000323 
Silica         .  .         .      ,    .         .  0*0000238 
Phosphate  of  lime,  iron  and  alumina      .  0*0000093 
Organic  matter     ....  0*0000467 
Free  carbonic  acid  .         .         .  0*0018 
0-27366 
In  100  imperial  gallons  (at  15°  C),  are  contained  about  one 
and  a  half  pounds  bicarbonate  of  soda  and  one  and  a  quarter 
pounds  common  salt. 
Charleston,  S.  C,  Jan.  21,  1869. 
— Am.  Jour,  Sciences  and  Arts  May,  1869. 
