64  Gleanings.  {^-rir^s^'™' 
nesium  sulphate,  sodium  bicarbonate,  potassium  bicarbonate,  tartaric 
acid,  sugar. 
6.  Chas.  Ellis  and  Co.,  "  Prepared  Citrate  of  Magnesia." — Qual- 
itative :  Magnesium  citrate,  sodium  bicarbonate,  potassium  salt  (a  trace), 
citric  acid,  sugar. 
Unluersity  of  Michigan^  July  i,  1874. 
GLEANINGS  FROM  THE  EUROPEAN  JOURNALS. 
BY  THE  EDITOR. 
An'ilin  Inks. — C.  H.  Viedt  objects  to  the  use  of  fuchsin  and  other 
anilin  colors,  which  are  insoluble  in  water,  and  recommends  the  employ- 
ment of  such  colors  only  v/hich  are  soluble  in  water.  Such  inks  do 
not  require  the  addition  of  gum  arable  or  dextrin,  except  for  slow  and 
heavy  writers,  and  should  be  so  far  diluted  that  the  writing,  when  dry, 
is  free  from  the  metallic  lustre  of  the  anilin  colors.  The  author  recom- 
mends the  following  proportions  : 
For  red  ink^  dissolve  i  part  of  diamond-fuchsln  in  150  to  200  parts  of 
boiling  water. 
For  blue  ink^  take  i  part  of  bleu  de  nuit  (anilin  blue,  soluble  in  water) 
to  200  or  250  parts  of  boiling  water. 
For  violet  ink^  which  is  very  extensively  employed,  i  part  of  the  color 
is  dissolved  in  about  300  parts  of  water.  This  ink  is  very  easily  affected 
by  ordinary  black  copying  ink,  a  pen  containing  some  of  the  latter  ren- 
dering the  former  at  once  very  pale  and  granular. 
Green  anilin  ink  is  the  handsomest,  but  also  the  dearest,  of  all  anilin 
inks.  It  is  prepared  by  dissolving  1  part  of  so-called  iodine  green, 
which  is  soluble  in  water  only,  in  100  or  110  parts  of  boiling  water. 
The  writing  is  of  a  blue-green  color  ;  if  a  more  yellowish-green  shade 
is  desired,  a  little  picric  acid  should  be  added. 
Telloiu  anilin  ink  cannoc  be  recommended.  A  solution  of  i  part  of 
picric  acid  in  120  or  140  parts  of  water  is  better  and  cheaper. — Ding- 
ier^ s  Poly  tech  n.  Jour.^  1874,  Oct. ^  pp.  167-169. 
Impurity  in  Commercial  Ammonia. — Dr.  G.  C.  Wittstein  calls  atten- 
tion to  the  fact,  that  nearly  all  the  commercial  ammonia  is  made  from 
gas  liquor,  which  contains  small  quantities  of  anilin,  toluidin,  &c.  In 
the  purification  of  gas  liquor  these  compounds  enter  with  the  ammonia 
into  all  other  combinations,  and  remain  finally  in  ammonia  liquor  in  such 
