220 
GLEANINGS. 
them  for  twenty- four  hours  in  dilute  alcohol  with  2  per  cent,  of 
sulphuric  acid  at  120°  Fahr.,  expressing,  filtering  and  supersatu- 
rating with  caustic  baryta.  The  precipitate  is  separated  by  a 
filter,  the  filtrate  is  then  treated  with  sulphuric  acid  in  slight 
excess,  and  distilled  to  recover  the  alcohol.  The  residue  is  then 
accurately  neutralized  with  carbonate  of  potassa  and  shaken 
with  ether,  which  removes  the  alkaloid.  The  ethereal  ex- 
extract  obtained  from  this  is  made  into  a  pulp,  with  1  part  of 
powdered  clay,  1  of  powdered  charcoal  and  2  of  ivory-black, 
which  is  dried,  spontaneously  powdered  and  extracted  by 
ether.  This  ethereal  solution,  by  evaporation,  leaves  a  white  sub- 
stance which  is  carefully  fused  by  a  moderate  heat  and  crystal- 
lized from  alcohol.  From  the  gold  salt  the  formula  C20  H17  N02 
has  been  calculated. 
Eau  de  Pagliari. — M.  Meyer  (Bull.  Soc.  Pharm.  Brux.)  re- 
gards the  manipulation  of  the  original  receipt  as  empyrical, 
which  consists  in  boiling  during  six  hours,  in  an  earthen  vessel, 
6  drachms  of  benzoin  in  powder,  12  drachms  of  alum  and  15 
ounces  of  water,  observing  to  agitate  frequently,  and  replace 
the  liquid  as  it  evaporates  by  boiling  water.  The  filtered  liquid 
should  be  preserved  in  closed  bottles.  He  proposes  to  modify  the 
process,  save  time  and  improve  the  preparation,  as  follows  : 
Take  benzoin  in  tears  90  grains ;  alcohol  of  90  per  cent.  225 
grains,  dissolve,  and  add  water  10  fluid  ounces,  alum  450  grains. 
Mix  and  boil  until  the  liquid  becomes  clear ;  filter  after  cooling. 
This  liquid  should  be  of  specific  gravity  6°  of  Baume's  hy- 
drometer for  salts. 
How  to  select  Indian  Ink. — Indian  ink  for  drawings,  according 
to  the  Editor  of  the  Franklin  Institute  Journal,  is  best  tested  in 
the  following  manner  : — Rub  off  a  portion  on  a  porcelain  surface 
with  water  to  the  proper  consistency,  then  with  a  ruler  draw  a 
number  of  lines  of  varying  thickness  on  a  piece  of  drawing 
paper.  When  dry,  brush  over  with  water  freely.  If  good  the  ink 
lines  will  keep  sharp  and  cloar,  whilst  poor  ink  will  run  or  spread 
sideways.  The  best  comes  from  Japan.  A  piece  of  slate  is 
better  than  glass  for  rubbing  it  down  to  the  condition  fit  for  use. 
