AmjuJl0yl^I8P76arm• }        The  International  Exposition.  3 2  r 
adding  potassium  iodide  and  estimating  the  iodine  by  sodic  hyposulphite, 
with  starch  as  the  indicator.  It  is  necessary  to  avoid  the  loss  of 
bromine  by  evaporation.  Practical  results  have  also  been  obtained  by- 
using,  instead  of  bromine,  a  mixture  of  5NaBr+NaBr03,  made  by 
acting  with  bromine  in  excess  upon  caustic  soda,  evaporating  to  dry- 
ness  and  mixing  well  by  trituration;  if  pure,  '751  grams  of  this  mix- 
ture are  required  for  *i  gram  of  phenol.  In  using  this  mixture,, 
hydrochloric  acid  is  added  to  liberate  the  bromine,  otherwise,  the  mani. 
pulation  is  essentially  the  same  as  before.  A  mixture  of  the  corres- 
ponding potassium  salts  appears  to  be  less  serviceable. — Phar.  Jour,  and 
Trans.,  April  15,  p.  821-824. 
NOTES  ON  THE  INTERNATIONAL  EXPOSITION. 
BY  THF  EDITOR. 
n- 
At  the  Paris  exposition  of  1867,  the  exhibits  of  each  nation  were  arranged  ria 
spaces  radiating  from  a  central  building,  which  was  surrounded  by  several  encircling 
avenues  of  an  oval  outline,  these  avenues  separating  the  various  groups  of  raw  and 
manufactured  materials  from  each  other.  It  was  thus  possible,  by  passing  along 
these  concentric  avenues,  to  examine  all  the  goods  of  the  same  class  that  were 
exhibited  by  the  different  nations  represented,  thus  affording  great  facilities  for 
reviewing  and  comparing  the  natural  resources  and  industries  in  any  special  class,, 
of  all  the  countries  exhibiting.  This  plan,  admirable  in  theory,  proved,  however,, 
a  failure,  in  so  far  as  many  nations  could  not  fill  the  space  allotted  for  the  different 
groups,  either  for  the  entire  want  or  comparative  non-importance  of  the  special 
industries,  so  that  the  otherwise  unavoidable  blanks  had  to  be  filled  with  goods 
from  other  groups.  Notwithstanding  this  drawback,  the  arrangement  offered  obvi- 
ous advantages,  which,  viewed  from  another  standpoint,  are  counterbalanced  by  the 
arrangement  of  the  present  exposition,  whereby  the  most  important  industries  can 
be  displayed  to  the*  best  advantage,  and  a  bird's-eye  view  obtained  of  the  total  pro- 
ductions of  each  country. 
While  it  must  be  acknowledged  that  the  general  plan  of  classification,  as  adopted 
by  the  Centennial  Commission  of  the  United  States,  has,  in  the  main,  been  adhered, 
to  also  in  the  arrangement  of  the  special  displays,  still  there  are  discrepancies,, 
which  render  the  systematic  study  of  any  particular  branch  of  industry  a  matter 
involving  considerable  labor,  often  increased  by  the  long  journeys  from  one  build- 
ing to  another  distant  one,  the  intercourse,  however,  being  facilitated  by  a  narrow- 
gauge  railroad,  with  frequently  running  trains,  which  convey  the  visitor  to  within 
the  immediate  neighborhood  of  all  the  important  buildings.  To  illustrate  the  dif- 
ficulty hinted  at,  we  may  briefly  mention  that  the  Main  Building  contains  the  greater 
portion  of  the  fixed  and  essential  oils,  while  very  important  displays  of  the  same 
class  of  goods  are  also  found  in  the  Agricultural  Building,  where,  likewise,  liquor- 
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