550  U.  S.  Pharmacopoeial  Revision.       { ^"^  l^^^^^^^^^To. 
Admissions  and  DeIvEtions. 
Additiojis  Recommended.  Deletions  Recommended. 
Acetyl-Salicylic  Acid  Aluminum  Hydroxide 
Arsphenamine  Ammoniated  Glycyrrhizin 
Barbital  ^  Bismuth  and  Ammonium  Citrate 
Barbital  Sodium  Ceylon  Cinnamon 
Barium  Sulphate  (Purified  for  X-Ray  Chondrus 
use)  Cottonseed  Oil 
Benzyl  Alcohol  Effervescent  Citrated  Caffeine 
Benzyl  Benzoate  Emulsion  of  Almond 
Carrell-Dakin  Solution  Ethyl  Carbamate 
Chloramine-T  Fluidextract  of  Staphisagria 
Chlorcosane  Glycerite  of  Hydrastis 
Chloretone  Lithium  Carbonate 
Di-Chloramine-T  Morphine  (Alkaloid) 
Neoarsphenamine  Saccharated  Ferrous  Carbonate 
Peanut  Oil  Serum  Antidiphthericum 
Picrotoxin  Serum  Antitetanicum  (The  purified 
Physostigmine  Sulphate  form  has,  in  practice,  entirely  super- 
Procaine  (Novocaine)  seded  the  last  two) 
Scarlet  Red  Sesame  Oil 
Silver  Albuminate  Solution  of  Sodium  Glycerophosphate 
Silver  Nucleinate  Sweet  Almond 
Solution  of  Benzyl  Benzoate  (20  per    Tincture  of  Lactucarium  (If  the  Syrup 
cent.)  is  prepared  from  the  drug) 
Tincture  of  Staphisagria  Uranium  Nitrate 
CHEMISTRY. 
Definitions  and  Derivations. — It  has  been  the  custom  of  the  U. 
S.  P.  to  state  the  derivation  of  organic  chemicals  and  to  give  some 
sort  of  a  definition  for  this  class  of  substances.  Tartaric  acid  is 
described  as  "A  dibasic  organic  acid,  usually  obtained  from  wine 
lees  or  argol."  Quinine  sulphate  is  defined  as  "The  sulphate  of  the 
alkaloid  quinine."  Such  statements  and  definitions  might  have 
been  useful  in  the  earlier  revisions,  but  they  are  no  longer  needed. 
With  the  present  official  status  of  the  U.  S.  P.  statements  of  this 
kind,  if  strictly  interpreted,  may  cause  misunderstandings.  Glycerin, 
for  instance,  is  defined  as  liquid  obtained  by  the  hydrolysis  of 
vegetable  or  animal  fats,  or  fixed  oils,  purified  by  distillation." 
Would  glycerin  made  by  fermentation  of  sugar  or  from  hydrocar- 
bons (several  patents  claim  the  latter  process)  and  purified  by  other 
means  than  distillation  not  be  suitable  for  pharmaceutical  use  if  it 
meets  all  purity  requirements?  The  same  applies  to  citric  and  tar- 
taric acids,  the  latter  of  which  may  eventually  be  made  from  benzine, 
and  to  a  number  of  other  official  organic  chemicals. 
