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GLEANINGS  FROM  THE  FRENCH  JOURNALS 
EXTRACT  OF  CORIANDER. 
Take  of  Coriander,  in  powder,  four  ounces. 
Oil  of  Coriander,  a  fluidrachm. 
Alcohol,  (95°,)  a  pint  and  a  half. 
Water,  half  a  pint. 
Mix  the  alcohol  and  water;  then  add  the  coriander,  previously 
mixed  with  the  oil,  and  macerate  for  twenty-four  hours,  with 
occasional  agitation,  finally  decant  the  liquid  from  the  dregs, 
put  these  in  a  percolator,  and  pour  on  the  decanted  liquid ; 
when  this  disappears,  add  sufficient  diluted  alcohol  to  make  the 
percolate  measure  two  pints. 
EXTRACT  OF  VANILLA. 
Take  of  Vanilla  of  good  quality,  an  ounce. 
Coarse  granular  sugar,  two  ounces. 
Simple  syrup,  a  pint. 
Diluted  alcohol,  a  sufficient  quantity. 
Cut  the  vanilla  transversely  in  small  sections,  and  triturate  it 
with  the  sugar  until  reduced  to  coarse  powder,  put  this  in  a  glass 
funnel  prepared  for  percolation,  and  pour  on  diluted  alcohol 
until  a  pint  of  tincture  has  passed  ;  add  this  to  the  syrup,  and 
mix  them. 
GLEANINGS  FROM  THE  FRENCH  JOURNALS. 
By  the  Editor. 
Ozone  as  the  cause  of  the  decomposition  of  Iodide  of  Potassium 
Ointment. — M.  Dannecy,  of  Bordeaux,  referring  to  the  frequency 
with  which  this  ointment  becomes  discolored,  and  the  irregular- 
ity of  its  occurrence  when  a  series  of  experiments  were  made, 
has  arrived  at  the  conclusion  that  it  is  a  phenomenon  due  to 
ozone  in  the  atmosphere,  and  that  it  occurs  most  readily  at  those 
periods  when  the  electric  condition  of  the  atmosphere  favors  the 
production  of  ozone.  The  author  had  occasion  to  prepare  this 
ointment  for  the  same  person  many  times  during  several  months, 
and  found,  in  ten  repetitions,  three  or  four  times  it  was  perfectly 
white  the  next  day,  whilst  in  the  other  cases,  the  color  varied 
from  pale  yellow  to  deep  yellowish  brown — he  being  conyinced 
