Am.  Jour.  Pi  arm. ) 
Aug.,  1881.  j 
New  Zealand  Kauri  Gum. 
419 
160°  and  180°,  but  above  this  latter  temperature  scarcely  anything 
more  could  be  got  to  distil  over,  even  in  a  vacuum;  the  residue,  when 
cold,  being  a  sticky,  gelatinous  mass.     On  repeated  fractionation, 
nearly  the  whole  of  the  oil  came  over  between  157°  and  159°,  very 
small  quantities  being  obtained  from  160°  to  170°  and  170°  to  180°. 
The  portion  from  157°  to  159°  was  distilled  three  times  over  sodium 
(which  acted  very  slightly  upon  it),  and  was  then  found  to  boil  almost 
•constantly  between  157°  and  158°.    This  final  product  had  a  strong 
odor  of  turpentine,  and  Avas  perfectly  colorless. 
On  combustion  it  yielded  the  following  numbers  : 
I.  0-2358  gram  substance  gave  0-2545  H^O  and  0-7600  CO,. 
II.  0-1290  gram  substance  gave  0-1428  H.^O  and  0-4180  CO,. 
III.  0-2160  grain  substance  gave  0-2322  H2O  and  0-6954  CO,- 
IV.  0-1970  gram  substance  gave  0*2126  H2O  and  0-6344  CO,. 
These  corresponded  with  the  following  percentages: 
I.  II.  III.  IV.       Required  for  C10H16. 
•Carbon,       .  ..  87-91     ,  88-37      87-80      87-82  88*23 
Hydrogen,         .  11-99       11-29       11-94       11-99  11-77 
The  liquid  had  a  specific  gravity  of  0*863  at  18°,  and  in  a  column 
^  of  300  mm.  in  length  acted  very  slightly  on  polarized  light,  giving  a 
rotation  to  the  left  of  3  or  4  degrees. 
By  the  action  of  phosphorus  pentasulphide  for  7  to  8  hours  it  was, 
for  the  most  part,  resinized,  but  a  small  quantity  of  liquid  distilled 
over  below  190°.  This,  by  repeated  distillation  over  sodium,  treat- 
ment with  strong  sulphuric  acid  and  fractionation^,  yielded  a  liquid 
boiling  at  174°  to  178°,  Avhich  had  the  odor,  external  characteristics 
and  composition  of  cymene,  and,  on  oxidation  with  chromic  liquor, 
yielded  terephthalic  and  acetic  acids. 
Attempts  were  made  to  isolate  some  other  substances  from  the 
higher-boiling  portions  of  the  original  oil,  but  on  fractionation  they 
all  tended  to  a  higher  and  lower  limit,  the  latter  being  about  160°  and 
the  higher  above  200° ;  and,  as  already  stated,  the  portions  above  200° 
seemed  to  polymerize  and  form  only  a  sticky  mass,  which  would  not 
distil  even  in  vacuo. 
From  the  above  facts,  it  a])pears  that  the  oil  produced  in  the  distil- 
lation of  Kauri  gum  consists  almost  entirely  of  a  terpene,  boiling  at 
157°  to  158°,  and  closely  resembling  the  other  members  of  the  same 
family  in  its  physical  and  chemical  characteristics;  the  higher-boiling 
portions  of  the  original  oil  being  apparently  formed  by  polymeriza- 
tion.— Jour.  Chem.  Soc,  May,  1881, 
