NOTE  ON  THE  RECOVERY  OP  ESSENTIAL  OILS,  ETC.  247 
Brodie's  experiments,  and  had  not  heard  of  them,  although  he 
had  spoken  to  many  chemists  on  the  subject.  He  considered 
it  a  great  boon  to  be  able  to  get  oxygen  by  a  cold  process,  and, 
at  all  events,  still  considered  the  application  new.  Authorities 
differed  as  to  the  value  of  oxygen  as  a  curative  agent,  but  the 
most  recent  experiments  of  Demarquay  and  Leconte  seemed  to 
prove  that  it  possessed  great  remedial  power.  Under  these 
circumstances  it  was  well  to  have  a  means  of  procuring  oxygen 
as  easily  as  making  a  cup  of  tea.  With  regard  to  Mr.  Wood's 
doubt  about  the  presence  of  ozone  instead  of  chlorine,  he  might 
say  that,  in  conjunction  with  Mr.  Brown,  now  of  the  War  De- 
partment, he  had  examined  many  specimens  of  oxygen  obtained 
from  the  chlorate  and  manganese  for  ozone,  but  in  all  cases 
found  chlorine  instead.  In  his  (Mr.  Bobbins')  process  the  oxy- 
gen was  well  washed. 
Mr.  Wood  said  that  washing  would  not  remove  ozone. 
Mr.  Bobbins  replied  that  Faraday  had  showed  that  ozone 
could  be  removed  by  washing,  and  he  himself  had  found  ozone 
made  by  means  of  phosphorus  in  the  ordinary  way  disappear 
after  shaking  with  water  well  for  an  hour. 
The  Chairman  said  he  considered  Mr.  Bobbins'  an  elegant 
way  of  procuring  oxygen  for  medical  purposes,  which  had  the 
recommendation  of  cheapness  when  the  oxygen  was  considered 
as  medicine — Chem.  News,  London,  March  12,  1864,  from 
Trans.  Lond.  Pharm.  Society. 
NOTE  ON  THE  RECOYERY  OF  ESSENTIAL  OILS  FROM 
THEIR  WATERY  SOLUTION. 
By  Mr.  T.  B.  Groves. 
I  had  occasion  a  short  time  since  to  attempt  the  concentra- 
tion of  an  aromatic  water  into  a  spirituous  essence.  It  occurred 
to  me  to  try  the  process  stated  in  the  "Beports  of  the  Juries, 
1851.  article  « Soaps  and  Perfumery,'  "  to  be  practised  by  M. 
Piver.  Accordingly  I  agitated  the  water  in  successive  por- 
tions, with  about  one-eighth  its  volume  of  olive  oil.  This  pro- 
cess, although  laboriously  followed,  with  proper  care  taken  in 
recovering  the  oil  after  each  shaking,  failed  to  transfer  any  large 
proportion  of  the  aromatic  oil  from  watery  to  oily  solution. 
