178  The  U.S. P.  Melting  Points.         { Amkp?iUCi9ioarm' 
Cinchonidine  bihydrobromide   7 
Cinchonidine  hydrobromide   60 
Cinchonidine  hydrochloride    21 
Cinchonidine  bihydrochloride   1.6 
Cinchonidine  salicylate    1320 
Cinchonidine  sulphate   92 
Cinchonidine  tannate   1800 
Cinchonine  alkaloid   8800 
Cinchonine  bi sulphate   1.5 
Cinchonine  hydrochloride   22 
Cinchonine  hydrobromide   59 
Cinchonine  bihydrobromide   1.8 
Cinchonine  salicylate  (cryst.)    590 
Cinchonine  sulphate    85 
Cinchonine  tannate    1100 
Cinchonine  tartrate    32 
Quinidine  alkaloid   6900 
Ouinidine  hydrobromide   190 
Quinidine  hydrochloride   86 
Ouinidine  hydroiodide   1220 
Ouinidine  salicylate   1650 
Quinidine  sulphate   95 
Ouinidine  tannate    2100 
Quinidine  tartrate   35 
Ouinidine  bitartrate    310 
THE  U.S. P.  MELTING  POINTS.* 
By  G.  A.  Menge,  Ph.D., 
Division  of  Pharmacology,  Hygienic  Laboratory,  U.  S.  Public  Health  and 
Marine-Hospital  Service. 
Any  one  who  has  had  occasion  to  apply,  to  any  great  extent,  the 
various  tests  prescribed  by  the  U.S. P.  will,  I  believe,  agree  with 
me  in  the  assertion  that  some  of  them  are  sorely  in  need  of  investi- 
gation and  standardization.  Perhaps  to  no  class  of  tests  does  this 
statement  apply  more  forcibly  than  to  melting  points.    The  chemist 
*  Read  before  the  City  of  Washington  Br.  of  the  A.  Ph.  A.,  Mar.  2,  1910. 
