138  Volatile  Oil  from  Canada  Balsam.  {AmMi?S;F»&m- 
plane  of  polarized  light  25-4°  to  the  left,  hence  (a)  D  equals  — 
28-128°. 
Mr.  Kressin  had  determined  the  physical  constants  of  this  frac- 
tion. On  comparison,  it  will  be  seen  that  the  relative  density  had 
increased  0-045,  and  that  its  optical  activity  had  decreased  6  6i°. 
Upon  analysis  this  fraction  yielded  the  following  results : 
I.  0*2031  gms.  of  substance  yielded  0*6236  C02  =  0*1681  C. 
and  0-2081  H20  =  0*023  H. 
II.  0*1776  gms.  of  substance  yielded  0*5459  C02  =  0*1488  C. 
and  0*1854  H20  =  0*0206  H. 
Found. 
Calculated  for  C10H16.  I.  II. 
Per  Cent.  Per  Cent.      Per  Cent. 
C.    88-23  83*739  83*829 
H.    11*76  11*423  n'599 
That  pinene  was  present  also  in  this  fraction  was  proved  by 
means  of  its  nitroso-chloride  7*136  —  7-7  —  6  39  per  cent.,  respect- 
ively, being  obtained  in  three  different  experiments.  The  melting- 
point  of  the  nitroso-chloride  proved  to  be  io2°-io3°  C.  To  further 
establish  the  presence  of  pinene,  the  benzyl-amine  base  was  pre- 
pared, which  closely  resembles  pinene-nitrol-benzylamine.  Its 
melting-point  proved  to  be  122°  C. 
FRACTION  VIII. 
The  bottle  containing  this  fraction  was  about  one-quarter  filled 
and  well  stoppered.  The  sides  were  covered  with  small  acicular 
crystals,  presumably  pinol-hydrate.  The  oil  was  filtered  and 
dehydrated  by  means  of  anhydrous  sodium  sulphate.  The  oil  was 
of  a  slightly  yellowish  tinge,  almost  colorless,  and  possessed  a  tere- 
binthinate  odor,  though  less  marked  than  the  lower  fractions.  Its 
relative  density  at  20°  C.  was  found  to  be  0*8805.  In  a  100  mm. 
tube  it  deviated  the  plane  of  polarized  light  30*187°  to  the  left, 
hence  (a)  D  equals  —  34*304°. 
Compared  with  Mr.  Kressin's  constants  we  found  the  relative 
density  had  increased  0*2.1 1  and  its  optical  activity  had  decreased 
5-893°. 
Upon  analysis  this  fraction  yielded  the  following  results : 
I.   0*231  gms.  of  substance  yielded  0-7138  C02  =0*1947  C. 
and  0*2466  H20  =  0*0274  H. 
II.  0*258  gms.  of  substance  yielded  0*8036  C02  =  0*21916  C. 
and  0*2932  H20  =  0*03257  H. 
