Amju°n"'i?8b9arm'}    Iodine  Absorption  of  Essential  Oils.  301 
These  observations  show  distinctly  that  the  oil  in  question  did  not 
contain  any  cinnamylcocaine.  It  has  already  been  stated  that  judging 
from  the  platinum  salt  of  hygrine  its  formula  is  C12H13N,  and  that  it 
may  be  a  trimethylchinoline,  corresponding  to  methylated  piperidine ; 
but  I  shall  return  to  this  subject  on  a  future  occasion. 
From  the  bases  of  true  coca  there  was  obtained,  after  separating 
cocaine,  a  .  fraction  which  had  the  same  percentage  composition  as  coca- 
mine,  but  differed  from  that  substance  by  its  solubility  in  petroleum 
spirit  and  in  other  particulars.  That  substance  I  termed  cocaidine. 
On  decomposing  it  with  dilute  hydrochloric  acid  it  was  however  ascer- 
tained that  a  sensible  quantity  of  cocaic  acid  was  formed,  as  well  as 
other  acids  and  an  oily  product  that  was  not  readily  decomposed  by 
hydrochloric  acid.  Consequently  cocaidine  is  a  mixture,  but  its  fur- 
ther investigation  must  be  deferred  for  want  of  material.  From  the 
solution  out  of  which  that  mixture  had  been  precipitated  by  ammonia 
oily  bases  could  be  obtained  as  above  described,  which  on  boiling  with 
dilute  hydrochloric  acid  behaved  in  the  same  manner  as  those  obtained 
from  the  other  kind  of  coca,  with  this  difference,  however,  that  the 
principal  part  of  the  acid  product  in  this  case  was  benzoic  acid. 
From  my  investigation  I  consider  I  am  justified  in  concluding  that 
the  "  amorphous "  bases  from  true  coca  consist  chiefly  of  benzoyl  com- 
pounds of  an  oily  nonvolatile  base,  together  with  some  cocamine,  while 
on  the  contrary,  those  obtained  from  the  other  kind  of  coca — the  so- 
called  Truxillo — consist  essentially  of  cocamine  and  the  cinnamyl  com- 
pounds of  that  oily  base;  also  that  cocamine  is  in  both  cases  accompa- 
nied by  another  base  containing  two  atoms  less  hydrogen,  which  I 
have  named  cocrylamine.  In  both  cases  the  amorphous  bases  yield 
some  hygrine,  but  whether  it  be  a  product  or  an  educt  I  have  not  been 
able  to  decide. 
THE  "  IODINE  ABSOKPTION  "  EQUIVALENT  OF  ESSEN- 
TIAL OILS.1 
By  R.  H.  Davies,  F.  I.  C,  F.  C  S., 
Chemist  to  the  Society  of  Apothecaries. 
Some  months  ago,  when  estimating  a  sample  of  reduced  iron  by 
means  of  iodine  solution,  I  observed  that  the  indiarubber  stopper  of 
1Real  before  the  Pharmaceutical  Society  of  Great  Britain,  at  an  Evening 
Meeting  in  London,  Wednesday,  April  10.  Reprinted  from  Phar.  Jour,  and 
Trans.,  April  13,  p.  821. 
