Am.  Jour.  Pharm.  1 
Oct.  l,  1874.  J 
Is  Ozone  a  Concomitant,  etc. 
481 
These  statements,  variously  modified,  have  been  so  often  repeated, 
that  at  last  they  are  almost  universally  received  as  matters  of  facts. 
But  although  a  vast  amount  of  work  has  been  done  on  this  subject, 
especially  by  Schonbein,  whose  peculiar  views  on  the  matter  are  so 
well  known,  yet  it  cannot  be  said  that  the  information  is  absolute.  On 
the  other  hand,  there  has  ever  existed  more  or  less  doubt  about  the  for- 
mation of  ozone  by  the  oxidation  of  such  bodies  as  oil  of  turpentine. 
It  was  with  the  view  of  acquiring  more  certain  knowledge  that  the 
author  made  a  series  of  experiments,  the  results  of  which  are  recorded 
an  a  paper  recently  read  before  the  Chemical  Society. 
In  commencing  his  experiments  he  first  of  all  wished  to  get  some 
definite  notion  as  to  the  rate  of  absorption  of  oxygen  by  such  bodies 
as  oil  of  turpentine.  For  this  purpose  the  liquid  to  be  experimented 
upon  was  enclosed  in  a  graduated  tube  containing  air  or  oxygen,  and 
the  volume  of  the  gas  read  from  time  to  time.  It  was  thus  seen  that 
•ether,  potassium-naphtha,  oil  of  turpentine,  and  such  bodies  rapidly 
-absorb  oxygen  from  air  or  oxygen  gas. 
A  few  cubic  centimetres  of  naphtha  absorbed  25  c.c.  of  oxygen  in 
36  days,  i.e.,  the  whole  of  the  oxygen  present.  In  yet  another  ex- 
periment with  air,  the  turpentine  oil  (not  in  sunlight)  absorbed  10*5 
c.c.  of  gas  during  14  days,  that  being  the  theoretical  amount  of  oxygen 
in  the  air  used. 
Benzen  showed  no  absorption  of  oxgen  during  40  days.  After  this, 
similar  experiments  were  made  with  the  oils  of  bergamot,  chamomile, 
caraway,  cloves,  juniper,  lemon,  thyme,  capivi,  cubebs,  etc.,  etc. 
The  numbers  given  in  the  following  table  are  not  valuable  as 
showing  the  absolute  relative  absorption  of  oxygen  by  the  various 
substances,  as  some  were  conducted  in  sunshine  whilst  others  were  not. 
Body  used. 
Oil  of  caraway...   
11  bergamot  
u  juniper  
11  cubebs  
"  lemon  
Naphtha  
Oil  of  turpentine  in  sunshine  (a)... 
"  "         "  shade  (b)  
"  "         "      "  (c)  
k<  chamomile    
Ether  (absolute)  (a)  
Ether  (absolute)  (6)  1    6-5  (f 
30 
c.c.  Oxygen  absorbed. 
No.  of 
days. 
=daily. 
c.c. 
6 
3 
12  14 
4 
3 
5  " 
2 
2-5 
4  " 
2 
2 
16  " 
13 
25 
33 
2  20 
6 
36-6 
20 
36 
•6 
14 
•75 
11 
•55 
6  5  " 
34 
.19 
34 
.19 
