A^"i87h7arrn-}       Emulsion  of  Oil  of  Turpentine.     •  345 
saturation  with  hydrate  of  iron,  that  is  best  ascertained  by  comparing  their 
taste,  which  in  the  former  is  scarcely  astringent,  while  that  of  the  latter 
is  distinctly  ferruginous.  A  preparation  now  before  me,  imported  from 
Germany,  called  Ferrum  oxydatum  dialysatum,  I  do  not  hesitate  to  say 
has  been  made  by  saturation  alone,  or  by  incomplete  dialysis  ;  for  its 
reaction  is  distinctly  acid  and  its  taste  quite  styptic.  Some  French 
preparations,  sold  by  the  same  name,  were  found  to  be  superior  to  the 
German  in  both  respects  ;  but  one  yielded  only  3*3  per  cent,  of  solid 
matter,  another  less  than  half  that  quantity.  A  5  per  cent,  solution 
of  dialyzed  iron  should  yield  3  grains  of  dry  residue  when  60  grains  of 
it  are  carefully  evaporated  to  complete  dryness. 
The  characteristics  of  a  5  per  cent,  solution  of  dialyzed  iron  may 
be  stated  to  be — 
1.  The  deep  brown-red  color,  which  in  thin  layers  i's  perfectly  trans- 
parent. 
2.  The  freedom  from  odor  and  taste,  it  being  merely  faintly  astrin- 
gent to  the  palate. 
3.  The  absence  of  even  slight  acid  reaction  to  test-paper  ;  and 
4.  The  behavior  to  tannin  and  to  saline  solutions  (even  spring 
water),  as  stated  above. 
It  is  best  given  by  itself  upon  sugar,  or  mixed  with  some  simple 
syrup  which  is  free  from  acid.  It  should  be  mentioned  yet  that  the 
same  preparation  has  made  its  appearance  in  Austria  as  catalytic  iron. 
EMULSION  OF  OIL  OF  TURPENTINE. 
By  Louis  Genois. 
Emulsionizing  oil  of  turpentine  and  volatile  oils  generally  is  considered 
a  rather  difficult  operation,  and  many  pharmacists  have  come  to  the 
conclusion  that  an  elegant  and  somewhat  permanent  mixture  is  almost- 
impossible.  Various  methods  have  been  suggested  to  overcome  the  diffi- 
culties, but  none  have  been  very  successful  ;  the  latest  process  I  believe 
is  that  of  Mr.  Forbes,  published  in  February,  1872,  in  the  "Amer. 
Jour.  Phar.,"  and  though  it  is  both  ingenious  and  rapid  of  execution, 
it  hardly  affords  a  satisfactory  result.  With  the  view  of  ascertaining 
the  possibility  of  finding  a  substance  that  would  answer  the  purpose 
better  than  anything  usually  employed,  I  made  a  number  of  expeiiments 
with  the  following:  gum  tracaganth,  dextrin,  starch  and  castile  soap. 
