PHARMACEUTICAL  NOTES.  103 
phate  of  cinchonia  in  the  same  manner  as  the  quinia  salt,  using, 
however,  but  five-eighths  the  quantity  of  water.  In  manner  and 
form  of  its  crystallization  it  resembles  most  closely  the  quinia 
salt.  It  is  sparingly  soluble  in  cold  water,  but  apparently  more 
freely  than  the  quinia  salt.  It  is  freely  soluble  in  alcohol  and 
chloroform,  and  very  sparingly  (if  at  all)  in  ether.  Placed  on 
heated  platinum  foil  it  immediately  deflagrates,  leaving  no  resi- 
due. 
Chlorate  of  Quinidia  may  be  prepared  from  sulphate  of  quinL 
dia  in  the  same  manner  as  chlorate  of  quinia.  This  salt  crys- 
tallizes quite  distinctively  from  the  preceding  salts,  forming  solid 
tubular  crystals,  which  are  evidently  derived  from  the  rhombic 
system.  It  is  more  sparingly  soluble  in  cold  and  boiling  water 
than  either  the  quinia  or  cinchonia  salts,  moderately  soluble  in 
alcohol  and  chloroform,  and  apparently  insoluble  in  ether.  Placed 
on  heated  platinum  foil  it  immediately  deflagrates,  leaving  a  small 
percentage  of  charcoal. 
Solution  of  Chlorate  of  Baryta.  A.  Dissolve  15  oz.  tartaric 
acid  in  2  pints  of  distilled  water,  add  gradually  14  oz.  carbonate 
of  soda  (in  clear  crystals),  and  filter.  This  forms  hitartrate  of 
soda. 
B.  Dissolve  12  oz.  pure  chlorate  of  potassa  in  2  pints  warm 
distilled  water,  and  filter  into  solution  A.  Evaporate  to  2  pints, 
allow  to  cool,  and  filter  from  precipitate.  By  double  decomposi- 
tion chlorate  of  soda  is  formed,  which  remains  in  solution,  and 
bitartrate  of  potassa  is  precipitated. 
C.  Dissolve  12  oz.  oxalic  acid  in  2  pints  water,  at  a  tempera- 
ture not  exceeding  112°  F.,  and  filter  into  solution  B.  Mix  the 
solutions  thoroughly,  and  expose  to  a  freezing  mixture  until  the 
temperature  has  fallen  below  32°  F.,  and  the  precipitate  has 
perfectly  subsided  ;  then  decant  the  clear  liquid  from  precipitate, 
express  the  residue,  and  after  filtering  the  expressed  liquid  add 
to  the  decanted  portion.  The  oxalic  acid  liberates  the  chloric 
acid,  forming  sparingly  soluble  oxalate  of  soda,  which,  by  aid  of 
the  freezing  mixture,  is  almost  entirely  precipitated.  A  small 
proportion  of  free  oxalic  and  tartaric  acids  and  oxalates  of  soda 
and  potassa  now  contaminates  the  solution  of  chloric  acid,  which 
is  otherwise  pure. 
