'^"ja^ytSL  "'  }  Preparation  of  Chlorate  of  Barium,  323 
may  be  mixed  with  three  or  four  ounces  of  warm  water,  and  passed 
into  the  bhidder  or  rectum. 
I  have  already  shown  that  absorption  is  readidly  affected  by  the 
mucous  membrane  of  the  bladder  and  therefore  general  as  well  as 
topical  effects  m  ly  be  expected  when  Santonine  is  introduced  by  this 
channel. 
In  cases  where  powders  are  objected  to,  a  pleasant  mixture  may  be 
made  by  adding  a  little  syrup  and  flavoring  water  to  the  Santonine 
solution. — The  Pharmacist,  April,  ISll,  from  London  Practitioner. 
PREPARATION  OF  CHLORATE  OF  BARIUM. 
By  C.  Widemann. 
Heat  for  half  an  hour  in  a  water  bath  tlie  following  mixtures  : 
One  molecule  of  crystallized  commercial  sulphate  alumina  Al^  (SO^)'^ 
+18IP0. 
One  molecule  sulphuric  acid. 
Two  molecules  chlorate  of  potassa. 
The  whole  dissolved  into  a  thin  paste  by  the  addition  of  a  sufficient 
quantit}^  of  distilled  water.    The  following  reaction  takes  place  : 
A12{S07-fH2SO*+2KCiO-^=AP(SO^fK2S04H-2HCiO^  or  alum 
and  chloric  acid. 
After  cooling,  the  alum  crystallizes.  To  the  cold  mass  add  three  or 
four  times  its  volume  of  alcohol,  then  filter  and  neutralize  the  filtered 
liquor  by  the  addition  of  baryta  water,  thus  forming  chlorate  and 
sulphate  of  barium,  also  separating  a  little  alumina ;  the  largest 
amount  of  alcohol  is  expelled.  The  liquor  is  then  refiltered  to  sepa- 
rate the  chlorate  in  solution,  and  then  the  filtered  liquid  is  evaporated 
to  crystallization. 
It  is  necessary,  in  order  to  obtain  a  very  pure  chlorate,  that  the 
sulphate  of  alumina  and  the  sulphuric  acid  be  used  a  little  in  excess. 
— Journ.  of  Applied  Ohem.,  Jmie,  1871. 
*  See  my  last  commuDication  to  the  Medio-Chirurgical  Society  on  the  Endem- 
ic Haematuria  of  the  southeast  coast  of  Africa. 
