AmASusi.Pi£m"}        Oils  of  Wintergreen  and  Birch.  401 
of  wintergreen,  Sample  I.,  was  submitted  to  combustion  with  the  fol- 
lowing results  : 
0*0981  gram  substance  gave  0*3122  C02  and  0*1048  H20. 
Found.  Calculated  for  C15  H^. 
C,  86*79  per  cent.  88*23  per  cent. 
H,  11-87     "  11-77  " 
98-66  100-00 
Vapor  Density. — 0*090  gram  substance  displaced  11*6  cc.  air. 
Found  6*73 
Calculated  for  C^H^  7*07 
The  combustion  was  repeated  with  a  larger  amount  of  substance, 
with  almost  identical   results,  and  another  determination  of  the 
vapor  density  of  a  sample  from  the  same  oil  by  the  hot  process  gave 
6*90. 
The  hydrocarbon  from  oil  of  birch,  sample  II,  gave  the  following 
results  on  combustion.  0'1142  gram  substance  gave  0*366  C02  and 
0*1201  H20. 
C,  87-41  per  cent. 
H,  11-69  " 
99-10 
Vapor  Density. — 0*1121  gram  substance  displaced  14  cc.  air. 
Found  6*95 
Calculated  for  C15H24  7*07 
Some  of  these  determinations  were  duplicated  without  perceptible 
variation  from  the  above. 
The  results  point  to  the  existence  of  gaultherilene  in  both  oils,  and 
that  it  is  a  sesquiterpene  of  the  formula  C15H24.  The  only  doubt  we 
feel,  in  concluding  this,  is  the  possibility  of  the  vapor  density  being  a 
coincidence,  since  the  hydrocarbon  may  be  composed  of  two  or  even 
more  compounds,  because  it  appears  to  be  made  up  of  a  solid  and 
a  liquid  portion. 
THE  ACIDS. 
We  next  directed  our  attention  to  the  alkaline  solutions  which 
were  set  aside  for  treatment  with  acid,  and  submitted  them  separately 
to  the  following  treatment. 
On  the  addition  of  chemically  pure  hydrochloric  acid  in  slight  ex- 
cess, salicylic  acid  separated.    This  precipitate  was  collected  on  a 
