504 
Gleanings  from  Foreign  Journals. 
Am.  Jour.  Pharm^ 
Oct.,  18S5. 
of  the  colorless  (or  nearly  so)  suspected  liquid ;  mix  with  2  cc.  of  the 
above  solution,  and  add  carefully  1'5  to  2  cc.  of  pure  concentrated  sul- 
phuric acid,  as  stated  under  dyphenylamine.  Suddenly,  or  in  a  few 
seconds,  the  acid  surface  assumes  a  yellow,  reddish  brown  or  brownish 
black  coloration.  For  the  detection  of  traces  of  the  acids  (1  in  5,000),, 
add  at  first  but  1  cc.  of  pure  sulphuric  acid ;  after  a  minute  shake  and 
mix;  then  add  with  care  1'5  cc.  of  pure  sulphuric  acid,  and  wait  1  to 
2  minutes,  when  the  surface  of  the  acid  shows  a  dark  color.  After  4 
or  5  minutes  shake  well,  to  mix  the  fluids,  which,  if  the  nitrogen  acids- 
were  present  in  very  slight  traces,  will  have  a  decidedly  yellowish 
color.  By  adding  sulphuric  acid  in  three  portions  a  yellowish  color,, 
resembling  that  of  white  wine,  was  obtained  with  -^-^-^  HNO3. — Ph.. 
Centralhalle,  ]8(S5,  p.  353. 
Naphthol  as  a  Reagent  for  Free  Chlorine  and  Bromine. — Chlorine' 
or  bromine  give  with  a  1  per  cent,  solution  of  naphthol  in  alcohol  a 
whitish  turbidity  and  precipitate,  the  latter  assuming  from  chlorine  2l 
yellowish  green  and  from  bromine  a  yellow  color.  If  the  detection  of 
mere  traces  of  chlorine  and  bromine  be  the  object,  place  in  a  narrow 
test-tube  3  or  4  cc.  of  the  liquid  to  be  tested,  and  then  pour  down 
along  the  side  of  the  test-tube  0*5  cc.  of  the  naphthol  solution  ;  in  a 
few  minutes  a  white  turbidity  will  be  observed  between  the  two  layers,, 
extending  when  slightly  shaken.  If  the  two  layers  be  mixed,  a  white 
opales(,*ence  or  turbidity  will  be  the  result.  Traces  of  chlorine  will 
show,  in  about  15  to  30  minutes,  a  greenish  tint;  bromine,  a  yellow- 
ish one.  Chlorine  or  bromine,  1  in  30,000  of  liquid,  will  show  the 
reaction  in  a  few  minutes;  if  in  40,000  parts  of  liquid,  10  to  12  min- 
utes were  required,  and  this  is  about  the  limit  of  dilution  for  this  reac- 
tion. Care  as  to  the  dilution  is  needed ;  for  instance,  hydrochloric 
acid  ought  to  be  weaker  than  20  per  cent.,  nitric  acid  about  or  weaker 
than  10  per  cent.,  etc. — H.  Hager,  in  Ph.  Centralhalle,  1885,  p.  366. 
Orange  Wine. — Pour  upon  the  peel  of  two  or  three  oranges,  placed 
in  a  vessel,  1  liter  of  hot  white  Avine;  cover  and  set  aside  for  three 
hours.  Dissolve  625  grams  of  sugar  in  half  a  liter  of  pure  water ; 
mix  the  resulting  syrup  when  cold  with  the  vinous  infusion,  and,  if 
desired,  color  with  saffron;  filter  and  bottle. — Science  pratique  ;  Leitm. 
Bdschau,  1885,  p.  432. 
Cement  for  Plaster  Casts. — Macerate  small  pieces  of  celluloid  in 
ether ;  pour  otf  the  light  liquid  and  use  the  remaining  thickisli  mass^ 
