ST.  REGIS  SULPHUR  WATER  OF  MASSENA,  N.  Y.  171 
obtained,  less  that  corresponding  to  one-half  of  the  hyposulphur- 
ous  acid,  gave  the  amount  of  sulphuric  acid. 
To  a  graduated  flask  containing  850  cc.  of  the  water,  was 
added  a  solution  of  chloride  of  barium  and  ammonia;  the  mix- 
ture, after  being  allowed  to  settle,  was  carefully  decanted,  the 
precipitate  twice  washed  by  decantation,  then  treated  with  hydro- 
chloric, and  afterwards  with  sulphuric  acid,  and  the  sulphate  of 
baryta  collected  and  weighed.  This  gave  the  baryta  correspond- 
ing to  the  sulphuric  acid  plus  carbonic  acid.  The  whole  of  the 
hyposulphite  and  sulphurets  remained  in  solution. 
Through  a  measured  flask  of  the  water  a  current  of  washed 
hydrogen  gas  was  conducted  as  long  as  any  sulphuretted  gas  was 
being  carried  off.  The  water  was  then  measured  with  iodide  of 
starch  solution  ;  the  loss,  as  compared  with  the  fresh  water,  gave 
the  quantity  of  free  sulphuretted  hydrogen. 
Another  quantity  of  the  water  was  mixed  with  a  neutral  solu- 
tion of  sulphate  of  manganese,  and  then  treated  with  hydrogen. 
The  gases,  as  evolved,  were  passed  through  an  ammoniacal  solu- 
tion of  nitrate  of  silver.  The  resulting  sulphuret  of  silver  repre- 
sented free  sulphuretted  hydrogen  plus  the  acid  in  the  hydrosul- 
phate  of  the  sulphuret  (of  sodium)  ;  and  the  quantity  of  this  half- 
combined  sulphuretted  hydrogen  was  found  by  deducting  the 
amount  of  free  sulphuretted  hydrogen  lost  in  the  first  treatment 
with  hydrogen  from  that  found  in  the  second  ;  and  the  amount  of 
alkaline  sulphuret  by  deducting  the  latter  amount  from  the  sul- 
phur precipitated  as  sulphuret  of  cadmium. 
The  bromine  was  determined  by  extracting  a  portion  of  the 
original  residue  obtained  by  evaporating  ten  litres,  with  alcohol, 
and  comparing  in  the  residue  from  the  evaporation  of  the  alcohol 
the  coloration  of  chloroform  by  chlorine  water,  first  with  a  solu- 
tion of  chloride  of  sodium,  and  then  with  a  weak  solution  of  bro- 
mide of  potassium  of  known  strength.  No  iodine  was  present, 
nor  were  any  rare  metals  noticeable. 
In  reference  to  the  presence  of  hyposulphites,  I  should  say 
that  in  several  of  the  analyses  of  the  Virginia  Springs  certain 
bodies  and  reactions  are  mentioned  and  referred  at  a  venture  to 
organic  sulphur  compounds  which  may  as  well  be  explained 
by  the  presence  of  this  same  acid. 
