124  The  Technical  Analysis  of  Water.  {AmMirch,T9Mrm' 
bases  separately,  but  this  method  would  not  be  accepted  by  the 
manufacturer. 
The  statement  of  results  of  an  analysis  of  the  same  water  as  inter- 
preted by  different  chemists  is  often  so  different  that  it  reflects  dis- 
trust upon  the  profession.  When  if  the  analyses  were  resolved  into 
their  acids  and  bases,  they  would  be  found  to  agree. 
Fresenius  states  that  "  a  certain  latitude  is  here  allowed  to  the 
analyst's  discretion." 
As  a  general  rule  I  state  the  magnesium  as  magnesium  carbonate 
as  far  as  possible,  this  combination  has  been  proven  to  exist  in 
preference  to  mag-nesium  sulphate  by  the  following  series  of  experi- 
ments : 
Two  waters  were  mixed  in  the  proportion  of  10  parts  of  artesian 
and  spring  water  to  I  part  of  city  water  and  passed  through  a 
heater  and  a  purifier.  Samples  were  collected  and  examined  at  the 
different  stages  and  also  a  sample  of  sediment  from  the  purifier. 
City 
Water. 
Springs  and 
Artesian  Wells. 
After  going 
through  heater. 
After  going 
through 
purifier. 
1 
Organic  and  volatile  undetermined 
2-734 
3-797 
3-557 
1  160 
NaCl  
6-12 
1-836 
■782 
•952 
Na2So4  
2-032 
CaCo3  
1-398 
i-355 
.  '795 
.649 
CaSo4   
3'403 
7*o68 
3  233 
3  573 
Mg.Co3  
1-764 
1-985 
1*544 
•662 
9-911 
18-073 
9911 
6  996 
9-055 
4  139 
5*174 
2-587 
CaCo3  by  titration  
3  '498 
3'7'8 
2-633 
1-521 
Grains  per  United  States  gallon. 
SEDIMENT  FROM  PURIFIER. 
Per  Cent 
Organic  and  volatile  (undetermined)  15-1 
CaC03  12-6 
CaS04    17 
MgO  15-5 
Fe203   19-6 
A1203  .  .   4*6 
Oil    3*o 
Silt  27-9 
