45 2  British  Pharmaceutical  Conference,  {^fembe^iso™' 
The  author  considers  hydrochloric  acid  to  be  the  worst  protective  agent  and 
phosphoric  acid  the  best,  glycerin  coming  second.  Champagne  quarts  and 
soda-water  bottles  are  found  to  be  less  liable  to  break  in  transit  than  other 
containers  of  hydrogen  peroxide  solution  ;  beer  bottles  with  patent  screw 
stoppers  come  next  in  order.  It  is  recommended  that  the  containers  be  always 
filled  to  within  about  two  inches  of  the  corks.  For  storing  the  peroxide  in  a 
laboratory,  the  author  advises  the  use  of  a  receiver  with  a  tap  at  the  base,  the 
solution  being  protected  by  a  layer  of  petroleum  carefully  poured  on  the 
surface. 
LIQUOR  BISMUTHI  ET  AMMONII  CITRATIS. 
By  Frank  R.  Dudderidge. 
The  author  adopts  a  method  of  assay  which  differs  from  the  B.P.  process  in 
the  following  respects  : 
(i)  The  solution  of  bismuth  oxynitrate  in  equal  volumes  of  nitric  acid  and 
distilled  water  is  not  added  till  opalescence  is  produced  ;  it  is  not  diluted  at  all  ; 
(2)  the  order  of  mixing  is  reversed,  the  potassium  salts  not  being  added  to  the 
bismuth,  but  the  bismuth  poured  carefully  into  the  solution  of  the  potassium 
salts,  which  is  kept  well  stirred  all  the  time  ;  (3)  the  potassium  salts  are  dis- 
solved in  a  definite  quantity  of  water,  two  fluidounces  for  an  imperial  pint  of 
product,  or  100  c.c.  for  a  litre.  This  forms  a  thick  magma,  to  which  is  added 
another  two  ounces  or  100  c.c.  of  water,  then  heated  to  the  boiling-point,  thrown 
on  to  a  filter  and  washed  with  hot  water  until  free  from  nitrate  contamination, 
when  it  is  easily  soluble  in  liq.  ammoniae.  He  also  finds  that  if  the  quantity  of 
potassium  carbonate  be  increased  by  one-third,  i.  e.,  240  grains  or  27  grammes 
being  used  in  place  of  175  grains  or  20  grammes,  the  washings  are  practically 
neutral,  and  very  little,  if  any,  loss  of  bismuth  results.  With  these  slight  modifi- 
cations, the  B.P.  process  may  be  easily  and  speedily  performed  in  any  pharmacy. 
THE  EXAMINATION  OF  THE  TERPENELESS  OILS  OF  LEMON 
AND  ORANGE  IN  THE  MARKET. 
By  T.  H.  Williams  Idris. 
The  author  has  examined  the  terpeneless  oils  of  lemon  and  orange  on  the 
market,  and  records  the  results,  which  show  great  difference  in  the  value  of 
the  respective  products.  Users  of  terpeneless  oils  are  warned  to  exercise  cau- 
tion in  purchasing  so-called  "terpeneless"  and  "concentrated"  lemon  oils 
offered  at  absurd  prices. 
TEREBENE,  B.P. 
By  Lewis  Ough. 
The  author  has  attempted  to  ascertain  to  what  extent  commercial  specimens 
of  terebene  correspond  with  the  B.P.  requirements  for  that  article,  and,  as  a 
result,  he  finds  that  it  is  most  varied  in  its  composition,  only  one  sample  out  of 
twelve  being  in  strict  accordance  with  those  requirements.  The  solubility 
of  the  samples  in  90  per  cent,  alcohol  varied  from  475  to  6  per  cent.,  the  solu- 
bility in  pure  ether  (specific  gravity,  0720)  from  1  in  10  to  1  in  20,  and  the 
solubility  in  methylated  ether  (0717)  from  1  in  14  to  1  in  2*5.  The  optical 
rotation  also  varied  greatly  in  the  different  samples. 
