AmFe°b.?if92arm'}  Abstracts  from  the  French  Journals.  77 
New  Reagents  for  Copper  Salts. — Le  Moniteur  de  la  Fharmacie 
(1 89 1,  1006)  states  that  pyrogallic  acid  and  a  cold  solution  of 
neutral  sulphate  of  sodium  yield  with  small  quantities  of  copper 
salts  a  blood  red  color.     1  cc.  of  a  solution  of  copper  sulphate, 
3  0  0  0  0  0  0*  S^  snows  the  reaction. 
Mr.  Deniges  evaporates  the  solution  to  be  analyzed,  to  dryness, 
and  adds  to  the  calcined  residue  one  drop  of  a  5  per  cent,  solution 
of  bromide  of  potassium.  The  mixture  is  again  evaporated  to  dry- 
ness when,  if  copper  be  present,  a  characteristic  violet  zone  of 
anhydrous  copper  bromide  appears. 
Reagent  for  Tannin. — Baemes  (Monit.  de  la  Pharm.%  1891,  1006) 
uses  as  a  reagent  for  tannin  a  solution  containing  in  10  cc,  1  gm. 
sodium  tungstate  and  2  gm.  sodium  acetate.  This  yields  with 
tannin  in  acid  or  alkaline  solution  a  straw-colored  precipitate  which 
is  insoluble  in  water.    The  reaction  is  said  to  be  very  sensitive. 
Reaction  of  Salol. — According  to  journal  de Pharmacie d 'Anvers, 
the  following  is  a  characteristic  reaction  of  salol.  A  small  quantity 
of  salol  is  added  to  a  few  drops  of  nitrosulphuric  acid.  The 
mixture  is  colored  yellow  and  on  stirring  with  a  glass  rod  it 
changes  to  brown  and  then  to  green.  On  diluting  with  about  50 
gm.  of  water  the  liquid  assumes  a  rose  color,  the  green  color 
reappearing  on  adding  ammonia.  Resorcin  treated  in  the  same 
manner  gives  a  deep  blue  color;  on  dilution,  red.  In  the  latter 
solution,  ammonia  causes  the  blue  color  to  reappear. 
A  New  Intestinal  Antiseptic. — Yvon  and  Berlioz  (your.  Pharm. 
Chim.j  1 89 1,  479)  use  in  place  of  the  /3-naphtholsalicylate  the 
/9-naphtholbenzoate  or  benzonaphthol.  This  is  prepared  by  heating 
250  gm.  powdered  /9-naphthol  and  270  gm.  pure  benzoylchloride  on  a 
sand  bath  slowly  to  1250  C.  and  then  for  half  an  hour  to  1700  C. 
After  cooling,  the  congealed  mass  is  crystallized  twice  from  8  to  10 
times  its  weight  of  boiling  90  per  cent,  alcohol.  The  /9-naphthol 
can  also  be  separated  by  heating  the  mass  with  dilute  sodium 
hydrate  (20  gm.  solution  of  sodium  hydrate  to  1  litre  of  water)  for 
20  minutes  to  50  or  6o°  C.  and  then  washing  until  the  product  gives 
no  blue  coloration  with  potassium  hydrate  and  chloroform.  Benzo- 
naphthol is  almost  insoluble  in  water,  more  soluble  in  alcohol  and 
easily  in  chloroform  ;  its  fusing  point  is  at  1100  C.  The  tests  for  its 
purity  are  as  follows :   (1)  A  blue  color  must  not  appear  when  a 
