THE  AMERICAN 
JOURNAL  OF  PHARMACY 
DECEMBER,  1905. 
A  CRITICAL  REVIEW  OF  THE  INORGANIC  CHEMISTRY 
OF  THE  NEW  UNITED  STATES  PHARMACOPCEIA. 
By  Henry  W.  Schimpf. 
{Continued  from  page  520.) 
The  inorganic  substances  which  have  been  dismissed  from  the  Phar- 
macopoeia are  the  following :  Ammonii  nitras,  Antimonii  oxidum, 
Antimonii  sulphidum,  Antimonii  sulphidum  purificatum,  Antimo- 
nium  sulphuratum,  Argenti  iodidum,  Barii  dioxidum,  Ferri  iodidum 
saccharatum,  Ferri  lactas,  Ferri  valerianas,  Hydrargyri  cyanidum, 
Hydrargyri  subsulphas  flavus,  Liquor  ferri  acetatis,  Liquor  ferri 
citratis,  Liquor  ferri  nitratis,  Liquor  sodii  silicatus,  Magnesii  citras 
effervescens,  Oleatum  zinci,  Plumbi  carbonas,  Potassa  cum  calce, 
Potassa  sulphurata,  Sodii  carbonas,  Sodii  carbonas  exsiccatus,  Zinci 
phosphidum.  Most  of  these  will  never  be  missed  and  their  dis- 
missal rids  the  Pharmacopoeia  of  so  many  useless  articles.  Several 
of  these  dismissed  articles  are,  however,  preparations  of  recognized 
worth  and  largely  used,  and  it  seems  a  mistake  to  have  dropped 
them  from  the  list  of  official  substances  ;  among  them  may  be 
mentioned :  Ferri  valerianas,  Hydrargyri  subsulphas  flavus,  Potassa 
sulphurata,  Sodii  carbonas,  and  Zinci  phosphidum. 
Ammonii  Nitras  is  employed  chiefly  in  the  making  of  nitrous  oxide 
gas,  which  is  used  largely  by  dentists  as  a  general  anaesthetic  when 
extracting  teeth.  Very  few  dentists,  if  any,  make  their  "  laughing 
gas,"  it  being  found  more  convenient  and  cheaper  to  buy  it  of  the 
manufacturers,  from  whom  the  gas  may  be  obtained  in  tanks. 
Barii  Dioxidum  owed  its  presence  in  the  U.S. P.  of  1890  to  the  fact 
that  a  method  for  the  preparation  of  Aqua  hydrogenii  dioxidi  was 
(55i) 
