512  020NE  AND  THE  VOLATILE  OILS. 
3.  The  oils  whose  atmospheres  do  act  upon  the  iodized  paper, 
act  with  widely  different  degrees  of  facility,  (Exp.  6,  9,  and  10.) 
4.  Oil  of  lemon  transcends  all  the  other  oils  for  promptitude  of 
-action,  whether  on  sulphindigotic  acid,  or  on  the  prepared  paper, 
by  atmosphere  or  by  contact. 
5.  Oil  of  cinnamon  acts  with  equal  ease  by  its  atmosphere  as  by 
•contact;  oil  of  lemon  sixty  times  more  slowly  by  its  atmosphere 
than  by  contact  $  oil  of  lavender  five  times  more  slowly;  oil  of  tur- 
pentine thirteen  times;  of  amber  seven  times;  of  croton  nineteen 
times  ;  of  peppermint  twelve  times  ;  others  from  30  to  120  and 
more  times  more  slowly  by  their  atmospheric  than  by  contact 
agency. 
6  The  atmospheres  in  the  bottles  are  not  pure  ozonous  atmos- 
pheres, but  are  modified  by  the  odoriferous  portions  of  the  oils. 
7.  The  color  of  the  stains  produced  on  the  paper  by  the  atmos- 
pheres of  the  oils,  and  by  the  oils  themselves,  are  so  similar  in 
several  cases,  as  to  lead  to  the  conclusion  that  the  volatile  oils 
themselves  are  the  sole  agents  in  both  cases,  the  vapors  of  the  oils 
being  condensed  upon  the  paper  in  the  case  of  the  atmospheres. 
I  have  used  the  term  ozonous  in  the  preceding  pages  more  in 
reference  to  the  suggestion  of  the  editor  of  this  journal,  in  a  note 
to  my  previous  communication,  and  for  its  temporary  convenience, 
than  from  any  satisfactory  evidence  that  I  have  been  able  to  verify 
the  conjecture.  It  is  true,  there  is  much  in  the  experiments  to 
tempt  one  to  the  conclusion  that  ozone  was  the  immediate  cause 
of  the  several  effects  corresponding  with  the  action  of  that  body ; 
but  when  we  consider  that  other  substances,  which  we  admit  act 
by  their  own  specific  powers,  produce  like  effects  in  like  relations, 
it  renders  the  correctness  of  the  conjecture  rather  problematical. 
Thus  No.  5  acts  upon  the  prepared  paper,  and  upon  solution  of 
sulphindigotic  acid,  as  the  oils  do;  both  its  vapor  and  its  liquid 
decompose  the  iodide,  and  bleach  the  indigo  solution.  "Why  may 
we  not  attribute  the  like  effects  of  the  essential  oils  to  a  'peculiar 
action  of  each  ?  There  are  various  experiments  by  which,  per- 
haps, the  question  might  be  decided;  such,  for  instance,  as  wash- 
ing an  atmosphere  of  some  of  the  oils,  or  otherwise  removing  the 
influence  of  every  agency  beside  ozone,  (if  it  exist)  and  then  test- 
ing ;  but  I  have  not  had  time  to  prosecute  the  enquiry  beyond  what 
I  have  already  recorded. 
