AmMa0yU,ri8P76?rm'}  Gleanings  from  the  Foreign  Journals.  219 
mixed,  sufficient  water  added  to  make  388  grams,  and  the  syrup 
finished  by  the  addition  of  625  grams  of  sugar  and  15  grs.  of  spirit  of 
lemon.  Twenty  grams  of  the  syrup  contain  0*2  phosphate  of  calcium 
and  o*i  of  ferrous  phosphate.— Schwei%.  Woch.  f.  Phar.,  1876,  No.  7. 
Indelible  Ink. — 200  grams  tartaric  acid  are  dissolved  in  1  litre  of  hot 
water;  in  one-half  of  the  solution  dissolve  100  grams  of  oily  anilin  ; 
add  the  other  half,  and  then  100  grams  of  chlorate  of  potassium. 
Allow  the  solution  to  cool  and  subside  until  next  day  ;  filter  from 
the  bitartrate,  and  bring  the  liquid  to  the  density  of  70  B.  Thicken 
sufficiently  with  gum  arabic,  and  add  to  each  litre  20  grams  of  copper 
sulphate,  dissolved  in  little  water.  This  ink  may  be  at  once  used  for 
printing  muslin  and  other  fabrics,  upon  which  the  black  color  will  be 
perfectly  developed  by  bleaching  liquids.  Chlorate  of  copper  is  also 
used  for  writing  upon  zinc  used  for  signs  and  labels  exposed  to  the 
weather. — Ibid.,  No.  10. 
Liquid  Glue. — One  part  of  phosphoric  acid,  specific  gravity  1*120, 
diluted  with  2  parts  of  water,  is  nearly  neutralized  with  ammonium 
carbonate,  one  part  of  water  added,  and  then,  in  a  porcelain  vessel, 
sufficient  glue  dissolved  in  the  liquid  to  obtain  a  syrupy  consistence.  It 
must  be  kept  in  well-closed  bottles.  The  addition  of  glycerin  or  sugar 
would  cause  the  glue  to  gelatinize. — Chem.  Centralbl.,  1876,  No.  6. 
To  prevent  the  cracking  of  glue  by  heat  or  extreme  dryness,  the  addi- 
tion to  the  solution  of  some  calcium  chloride  is  recommended,  which 
retains  sufficient  moisture  to  obviate  this  inconvenience.  Thus  prepared, 
glue  can  also  be  used  upon  glass  and  metallic  surfaces. — Ibid.,  No.  9. 
Waterproof  varnish  for  paper,  &c,  is  obtained  by  precipitating  a  solu- 
tion of  tallow  or  resin  soap  by  aluminum,  iron  or  copper  sulphate,  and 
dissolving  the  precipitate  in  a  liquid  hydrocarbon,  or  in  carbon  bisul- 
phide.—/^., No.  8. 
The  estimation  of  tannin,  by  Carpene's  method,  has  been  modified  by 
J.  Barbieri  as  follows,  whereby  correct  results  are  obtained  :  The  tan- 
nin solution  is  precipitated  by  an  excess  of  an  ammoniacal  solution  of 
zinc  acetate,  the  entire  mixture  heated  to  boiling,  evaporated  to 
two  thirds,  and  filtered  after  cooling  ;  the  precipitate  is  dissolved 
in  diluted  sulphuric  acid,  filtered,  if  necessary,  and  then  titrated  with 
solution  of  potassium  permanganate,  which  has  been  previously  titrated 
with  commercial  tannin.  The  results  are  said  to  be  exact. — Apoth. 
Zeitung,  1876,  No.  8,  from  Ber.  d.  d.  Chem.  Ges. 
