Am.  Jour.  Pharm.  ) 
September,  1909.  j 
Progress  in  Pharmacy. 
423 
Organic  Arsenic  Compounds. — W.  Harrison  Martindale  gives 
the  following  definitions  for  organic  arsenic  compounds : 
Arsonic  acid  indicates  arsenic  acid,  AsO.  (OH)3,  in  which  one  of 
the  hydroxyls  is  replaced  by  an  organic  radicle.  An  arsonate  is  a 
salt  of  this  acid. 
Arsinic  acid  constitutes  a  dialkyl  or  dialphyi  derivative  of  arsenic 
acid,  i.e.,  cacodylic  acid,  and  its  homologues :  phenylarsinic  acid 
(C6H5)2AsO.OH.  It  should  be  understood  that  the  French  and 
German  chemists  do  not  as  a  rule  make  these  distinctions. 
Arylarsonate  is  the  term  used  to  indicate  an  aromatic  arsonate. 
Aryl  indicates,  e.g.,  phenyl,  tolyl,  xylyl,  or  naphthyl  as  applied  to 
substituted  hydroxyl  in  arsenic  acid. 
Arsanilic  acid  is  a  name  given  to  />-aminophenyl  arsonic  acid, 
the  sodium  salt  of  which  is  in  such  repute  at  the  present  time. 
Arsenoic.  This  term  is  found  in  French  literature  as  referring 
to  aromatic  arsenic  bodies  containing  two  atoms  of  arsenic  believed 
to  be  coupled  together  by  a  double  linkage,  e.g.,  C6H5As  = 
AsC6H5,  arsenobenzene,  comparable  with  CGH5-N  =  N-C6H5 
azobenzene. — Ch'em.  and  Drug.,  1909,  v.  75,  p.  19. 
Citarin. — J.  Lorenzen  calls  attention  to  some  unexpected  second- 
ary effects  that  may  be  caused  by  citarin,  sodium  anhydromethylen- 
citrate.  He  asserts  that  this  substance  is  readily  decomposed,  liber- 
ating free  formic  aldehyde,  which  he  asserts  can  be  readily  demon- 
strated by  the  sense  of  smell. — Apoth.  Ztg.,  1909,  v.  24,  p.  478. 
Cyanotoxin. — This  name  is  applied  by  H.  Fuinemore  to  a  sub- 
stance isolated  from  Apocynum  cannabinum  after  the  removal  of 
the  apocynin  by  means  of  ether.  Cyanotoxin  is  said  to  have  the 
formula  C20H28O6  an;l  occurs  as  white  rhombic  pyramids  having 
a  melting-point  of  about  1650  C.  It  is  comparatively  insoluble 
in  water  but  has  an  intensely  bitter  taste. — Apoth.  Ztg.,  1909,  v.  24, 
491  (from  Proc.  Client.  Soc). 
Elaterin. — A.  Berg  reported  making  cryoscopic  determinations 
of  elaterin  to  ascertain  the  formula  which  he  believes  to1  be  C2S- 
H38Oc.  He  has  made  a  number  of  derivatives  of  elaterin  such  as 
diacetyl  elaterin,  elateridin,  elateroxin,  bromide  derivatives,  and 
products  formed  by  the  action  of  silver  oxide.  From  these  he  is  able 
to  show  that  the  elaterin  molecule  contains  two  hydroxyl  ethereal 
phenols,  an  acetyl  group  and  a  ketone  radicle. — Chem.  and  Drug., 
J 909,  v,  74,  p.  874. 
Euphylline  is  a  crystalline  combination  of  theocine  and  ethylen- 
