OLEUM  jETHEREUM  AND  SPIRITUS  iETHERIS  COMPOSITUS.  195 
5th  charge.  Proportions  and  materials  same  as  the  third,  dis- 
tilled after  6  hours  (instead  of  12  to  24  hours)  of  contact  yielded 
17  f.^  of  oily  stratum,  or  10  f.3=646  grains  of  finished  oil,  s.  g. 
L0645  at  72°. 
In  this  operation  634  f.^  of  alcohol  and  83J  ft.  of  acid  yielded 
37  f.3  of  finished  oil,  or  -73  per  cent,  of  the  measure  of  the  alcohol 
used.  The  preserved  specimens  of  these  products  have  all  under- 
gone similar  change  of  color  to  those  before  mentioned,  except  that 
the  last  three  of  the  five  are  of  a  different  deeper  color,  very  much 
like  that  of  aromatic  sulphuric  acid.  Blue  litmus  paper  is  not 
affected  by  any  of  these  specimens  until  the  moistened  paper  has 
been  exposed  for  a  few  moments,  when  it  becomes  red.  In  this 
reaction  these  last  do  not  differ  from  the  earlier  specimens,  al- 
though in  these  no  alkaline  solution,  but  distilled  water  only,  was 
used  in  the  washing. 
In  the  following  series  of  three  charges  the  proportions  of  the 
IT.  S.  Pharmacopoeia  were  pretty  closely  observed,  the  quantity 
of  alcohol  being  the  same  as  in  the  last  series. 
1st  charge.  Alcohol,  s.  g.  -832  at  60°  125  f.g==6  ft.  8  oz.  av. 
Acid,       «  1-842  «  65Q188fJ=23«  0  «  « 
distilled  after  prolonged  contact,  yielded  9  f.§  of  crude  oily 
stratum  (below),  or  5J  f.3  of  finished  oil  s.  g.  1-1463  at  72°. 
2d  charge.  Alcohol,  s.  g.  -835  at  58°  125  f.J  =6  ft.  8  oz.  av. 
Acid,       «  1-842  «  65°  174  f.g=20" 
distilled  without  prolonged  contact  yielded  8  f.^  of  crude  oily 
stratum  (above),  or  1  f.^=  505  grains  of  finished  oil  s.  g.  1*0703 
at  72°. 
3d  charge.  Alcohol,  s.  g.  -835  at  58°  126  f,$~*  6  ft.  12  oz.av, 
Acid,      «  1-846  «  60°  189  f  J=  22  «   8| «  « 
distilled  after  prolonged  contact,  yielded  4  J  f.^  crude  oily  stratum 
(above),  or  3f  f.5— 242  grains  of  finished  oil,  s.  g.  1-0592  at 
72°. 
In  this  series  379  £$  of  alcohol  and  66  ft.  of  acid  yielded 
17  J  f.3  of  finished  oil,  or  -57  per  cent,  of  the  measure  of  the  alco- 
hol used.  Specimens  from  the  product  of  these  charges  have  all 
become  decomposed,  and  separated  into  two  strata,  light  colored 
below,  and  dark  reddish  brown  above.  The  sensible  properties 
and  reaction  with  litmus  paper  of  the  dark  portion,  are  the  same 
as  in  the  other  specimens.  The  lower  stratum  is  more  oily,  strong- 
