Am.  Jour.  Pharm.  ) 
Oct.  1,1874.  J 
h  Ozone  a  Concomitant ,  etc. 
483 
potassium  iodide.  It  further  resembles  peroxide  of  hydrogen,  be- 
cause it  gives  a  violet  coloration  with  chromic  acid  solution  acidulated 
with  sulphuric  acid.  It  cannot,  however,  be  peroxide  of  hydrogen, 
because,  although  it  is  somewhat  soluble  in  water,  the  solution  retains 
its  properties  after  long  continued  boiling.  It  again  resembles  the 
aforementioned  bodies  by  being  totally  destroyed  by  peroxide  of 
manganese,  but  it  also  differs  from  them  by  having  much  more  stable 
properties,  resisting,  to  a  certain  extent,  the  action  of  sodium  hypo- 
sulphite, and  temperatures  considerably  above  the  boiling-point  of 
water.  Although  destroyed  by  peroxide  of  manganese  and  other 
agents,  the  body  again  forms  on  exposure  to  air  and  moisture. 
Lastly,  the  active  agent  so  like  to  ozone  is  destroyed  at  the  boil- 
ing-point of  oil  of  turpentine,  viz.,  160°,  and  temperatures  at  which 
ozone  and  peroxide  of  hydrogen  are  not  destroyed,  when  chloride  of 
zinc  is  present.  It  is  also  destroyed  by  other  dehydrating  agents 
and  by  certain  deoxidizing  agents. 
It  is  increased  in  amount  by  heating  to  100°  in  presence  of  water, 
but  in  the  oil  which  distils  over  at  that  temperature,  there  is  none  of 
it.  Simple  exposure  to  air  is,  however,  alone  necessary  for  its 
formation,  and  then  it  has  the  same  properties  as  the  parent  oil. 
Oil  of  turpentine  is  generally  credited  with  the  power  of  ozonizing, 
the  air  in  its  vicinity,  as  well  as  with  the  power  of  dissolving  a  certain 
amount  of  the  ozone  to  which  its  oxidation  is  supposed  to  give  rise. 
This  is  because  it  has  long  been  known  that  potassic  iodide  test-paper 
exposed  to  its  vapor  speedily  indicates  the  well-known  reaction  of 
ozone ;  but  this  must  now  be  explained  by  the  oil  evaporating  and 
oxidizing  to  this  peculiar  product,  for  the  oil  which  has  been  sub- 
jected to  the  action  of  peroxide  of  manganese  or  chloride  of  zinc,  or 
any  of  the  other  means  which  have  been  pointed  out  as  efficient  in 
destroying  the  active  principle,  no  longer  has  the  power  of  so  influenc- 
ing the  air  in  its  vicinity,  until  it  has  been  allowed  to  stand  in  con- 
tact with  air  (and  moisture  ?)  for  some  time. 
By  experiments  now  in  hand,  the  author  hopes  to  be  able  to  adduce 
more  conclusive  evidence  as  to  the  composition  and  constitution  of 
the  oxidized  product  of  oil  of  turpentine,  which  possesses  such 
interesting  properties ;  also  to  show  more  precisely  the  circumstances 
under  which  it  is  produced,  and  to  build  it  up  synthetically  from 
terpene  or  cymene,  etc.    For  the  present  he  can  only  hint  at  its 
