Amjune^i89ifrm'}  Gleanings  from  the  German  Jour?ials.  291 
E.  These  extracts  are  to  be  put  up  in  metal-boxes  or  glass 
bottles. 
Extracts  for  copying  inks. — For  these  the  directions  for  use  are 
the  same  as  for  writing  inks  ;  they  differ  only  in  being  more  concen 
trated  when  made.  The  following  constitutes  the  base  :  70  0  tannin, 
30  0  dry  ferric  sulphate,  15-0  gum  arabic  and  100  sugar.  For  blue 
add  to  the  above  base  io-o  soluble  aniline  blue  IB;  for  red,  10-0 
Ponceau  RR;  for  violet,  4-0  Ponceau  R  R  and  60  soluble  aniline- 
blue  IB;  for  green,  io-O  aniline-green  D;  for  blue-gree?i,  7-0  aniline- 
green  D  and  3-0  soluble  aniline-blue  IB;  for  black,  20-0  deep  black 
E;  for  an  alizarine  ink  add  io-o  dry  indigo-carmine  (Indigotin). — 
E.  Dieterich,  Pharm.  Centralhalle,  1891,  190. 
Christia  and  Fibrine-Christia  are  English  manufactures  intended 
to  replace  gutta-percha  paper,  silk  protective,  etc. ;  christia  is  made 
by  treating  manila-fibres  in  such  a  manner  as  to  make  it  insoluble, 
and  impervious  to  water  and  alcohol ;  fibrine-christia  is  made  by 
treating  a  silk-texture  in  the  same  manner.  According  to  an 
examination  of  E.  Dieterich  the  treatment  to  which  the  manila  and 
silk  is  subjected  is  the  application  of  a  chromium-gelatin  solution 
and  exposing  afterwards  to  sun-light.  The  following  is  the  tabu- 
lated result  of  the  analyses  : 
Christia  Fibrine— Christia 
I  II 
a.  b.      dense  texture,  gauze. 
Loss  at  ioo°  C.  (moisture),  .  .  .  .     16*0  16*5  i6'o  17*2 
Water  soluble  (glycerin  and  salts),    29^0  29*0  26*5  30*0 
leaving  ash,   6*8i  6*25  675   . 
Insoluble  chromium  gelatin  (dis- 
solved in  hot  30  per  cent,  acetic 
acid)   26*0         29-5  48x>  48*5 
Remaining  fibre   29*0  25-0  9*5  4*3 
Dieterich  states  the  following  mixture  spread  upon  both  sides  of 
imitated  parchment  paper  will  give  an  article  handsomer  in  appear- 
ance than  the  Christia :  30-0  gelatin  (or  glue)  are  allowed  to  swell 
up  in  200-0  water  and  then  dissolved  by  heating  to  the  boiling-point ; 
add  30  0  glycerin  30°  B.  and  lastly  3-0  finely  powdered  potassium 
bichromate.  Exposure  to  sun  light  reduces  the  bichromate,  the 
yellow  color  changing  to  a  dirty-green  ;  this  change  is  accompanied 
by  another  rendering  the  gelatin  insoluble. — Pharm.  Centralhalle, 
1891,  193. 
Creasote. — A.  Reissmann  made  some  experiments  upon  the  best 
