ON  THE  MANUFACTURE  OF   RESIN  OJL  FROM  ROSIN.  119 
was  separated,  and  which,  submitted  to  distillation,  was  almost 
entirely  disengaged  between  105°  and  101°  C.  Towards  the 
end  of  the  operation,  the  thermometer  rose  rapidly  to  210°  C, 
and  remained  stationary  at  that  point.  The  most  volatile  por- 
tions, forming  more  than  nine-tenths  of  the  crude  material,  being 
submitted  to  a  second  rectification,  distilled  at  a  temperature  of 
106°  C.  It  is  a  colorless  liquid,  possessing  a  strong  ammonia- 
cal  odor,  at  the  same  time  resembling  that  of  pepper  ;  it  re- 
stores the  blue  color  of  reddened  litmus  paper,  has  a  very 
caustic  taste,  and  saturates  the  most  powerful  acids.  It  dis- 
solves in  all  proportions  of  water,  to  which  it  communicates  very 
distinct  alkaline  properties;  the  solution  acts  in  a  manner  analo- 
gous to  that  of  ammonia  with  respect  to  saline  solutions ;  it 
does  not,  however,  appear  to  re-dissolve  the  oxides  of  copper  and 
zinc. 
This  base  forms  perfectly  crystallized  compounds  with  hydro- 
chloric, hydrobromic,  hydriodic,  sulphuric,  nitric  and  oxalic 
acids.  The  hydrochlorate  yields  with  chloride  of  gold  a  crys- 
talline powder,  formed  of  small  needles  of  a  golden  yellow  color  ; 
and  with  the  bichloride  of  platinum,  a  compound  which  crys- 
tallizes in  long  needles  of  an  orange  color.  Several  analyses  of 
this  substance  made  by  M.  Cahours,  furnish  exactly  the  same 
results  ;  the  numbers  correspond  to  the  formula  C10  H11  N,  which 
has  been  verified  as  well  by  the  analyses  of  its  salts  and  some 
of  its  derivatives,  as  by  the  density  of  its  vapor ;  the  preceding 
formula  representing  four  volumes.  M.  Cahours  proposes  to 
give  this  new  alkali  the  name  of  piperidine. — Annals  of  JP harm.  ^ 
May  1852. 
ON  THE  MANUFACTURE  OF  RESIN  OIL  FROM  ROSIN, 
[The  following  account  of  "  Resin  oil,"  and  its  products,  is  extracted 
from  an  article  in  the  (London)  Pharmaceutical  Journal  for  January,  1853, 
and  will  throw  some  light  on  the  nature  of  similar  products  made  in  this 
country. — Editor.] 
The  resin,  from  the  distillation  of  which  the  resin  oil,  or  as  it 
is  most  frequently  called  the  pine  oil  is  obtained,  is  the  black 
kind,  called  also  colophony,  and  it  would  appear  that  the  dis- 
covery of  this  oil  originated  from  the  circumstance  that  a  work* 
