12  Abies  Balsamea,  Miller.  {^Ikiltl^m™- 
had  separated.  These  were  filtered  off  and  the  mother  liquid  set 
aside  again.  In  all,  three  crops  of  crystals  were  obtained.  Their 
respective  melting  points  were  134^°,  1 35 0  to  1360,  136^°  to 
l37/4°'  The  combined  products  were  so  small  that  nothing  more 
could  be  done  with  the  same. 
fraction  i65°-i68°  O 
A  colorless  oil  of  a  more  distinctly  terebinthinate  odor  than  frac- 
tion i6o°-i65°  C;  specific  gravity  0-8719  at  200  C.    In  a  100-mil- 
limetre  tube  it  deviated  the  ray  of  polarized  light  27-55°  to  the 
left,  hence  (a)B  =  —  31*58°. 
BORNEOL. 
The  crystals  which  had  congealed  in  the  condensing  tube  during 
fractional  distillation,  when  dried  on  a  porous  plate,  were  found  to 
have  a  melting-point  of  20i°-202°  C.  Upon  exposing  the  various 
fractions  to  the  temperature  of  a  freezing  mixture,  fractions  168°- 
I72°C.  and  i72°-i85°  C.  yielded  more  of  the  borneol.  This  was 
collected  and  crystallized  from  petroleum  ether.  The  crystals  con- 
sisted of  large  shining  plates  having  the  characteristic  appearance 
and  odor  of  borneol.1 
ACETIC  ACID. 
The  acid  which,  by  the  saponification  of  the  oil,  had  been  con- 
verted into  a  potassium  salt  was  set  free  by  sulphuric  acid  and  dis- 
tilled off  with  water  vapor.  The  distillate  was  neutralized  with 
sodium  carbonate,  evaporated  to  dryness,  the  residue  repeatedly 
extracted  with  hot  absolute  alcohol  and  the  hot  solution  filtered. 
The  filtrate  was  set  aside  to  crystallize.  The  crystals  were  dis- 
solved in  a  small  quantity  of  water  and  silver  nitrate  added.  The 
silver  salt,  which  crystallized  in  needle-shaped  crystals,  was  drained, 
washed  and  dried. 
0-19  gram  of  the  salt  yielded  0*1215  gram  silver. 
Calculated  for  C2H302Ag.  Found 
64-65  per  cent.  63*95  per  cent. 
With  considerable  degree  of  certainty  it  may  be  said  that  laevo- 
gyrate  pinene  and  laevogyrate  bornyl  acetate  are  present  in  this  oil. 
Bertram  and  Wahlbaum2  attribute  the  odor  of  firs  to  the  presence 
1  Liebig's  Amialen,  Vol.  230,  p.  226. 
^Archiv  d.  Pharm.,  Vol.  231,  p.  290. 
