318 
GLEANINGS  FROM  GERMAN  JOURNALS. 
drop  is  as  good  as  if  freshly  prepared.  (Schweiz.  Wochenschr. 
f.  Ph.,  1866,  N.  26. 
Preservative  against  cholera.  (See  also  Amer.  Journ.  Pharm., 
186*6,  p.  46.)  Dr.  La  Roche,  of  Kurnik,  recommends  quinia 
for  this  purpose,  and  states :  I  believe,  that  this  remedy  is  of  no 
less  value  against  this  disease  than  vaccination  against  the  small- 
pox. Adults  take,  at  the  approach  of  the  epidemic,  twenty-four 
grains  in  hourly  doses  of  two  grains;  afterwards,  for  three 
weeks,  two  grains  three  times  a  day,  when  the  dose  is  diminished 
to  two  grains  morning  and  night,  and  this  continued  until  after 
the  disappearance  of  cholera.  Grown  persons  may  take  it  in 
pills,  children  best  in  syrup  of  liquorice  root.  The  regimen 
must,  of  course,  be  a  proper  one,  and  the  well-known  rules  for 
the  prevention  of  cholera  must  be  strictly  observed.  I  also 
warn  earnestly  from  the  repeated  use  of  the  so-called  cholera 
bitters,  liquors,  &c,  which  are  directly  deleterious,  and  increase 
the  disposition  to  this  disease.  They  are  the  serpent  among 
flowers.    (Ph.  Centralhalle,  1866,  N.  40.) 
Sulphuret  cf  carbon  in  petroleum.  Hager  observed  it  in 
American  petroleum  ;  the  portion  distilling  below  80°  C.  con- 
tains nearly  all ;  the  oil  obtained  above  120°  0.  is  free  from  it. 
It  may  be  removed  by  agitation  with  mercury,  with  or  without 
the  previous  use  of  sulphuric  acid.  (Ph.  Cent.  Halle,  1866 
N.  44.) 
Protiodide  of  mercury.  Dr.  Rieckher  proposes  to  triturate 
100  parts  biniodide  with  44  parts  metallic  mercury,  keeping  the 
mixture  moist  with  a  little  alcohol,  and  afterwards  washing  the 
product  with  alcohol,  to  remove  biniodide.  It  is  a  dark  green 
powder  with  a  tinge  of  yellow.*  (N.  Jahrb.  f.  Ph.,  1866,  Jan. 
21—24.) 
Frederking  uses  16  parts  mercury,  10  parts  sublimed  iodine, 
and  two  parts  alcohol ;  after  the  evaporation  of  the  alcohol,  he 
washes  the  preparation  with  two  parts  iodide  of  potassium  in 
six  parts  water,  then  with  pure  water,  and  dries  at  a  tempera- 
ture of  20°  C.    The  preparation  is  entirely  free  from  biniodide 
*This  process  was  recommended  by  Winkler  over  twenty  years  ago, 
and  Prof.  F.  J.  Otto  suggested  to  remove  biniodide  by  alcohol. 
