Am.  Jour.  Pliarui.  | 
Sept.,  1882  J 
Acid-proof  Cement. 
441 
^ilace  them  with  a  mixture  of  1  volume  of  strong  alcohol  and  3  vol- 
umes of  distilled  water,  until  2  gallons  of  percolate  are  obtained. 
Meanwhile  prepare  from  6  })ints  of  solution  of  tersulphate  of  iron, 
hydrated  sesquioxide  of  iron  bv  the  formula  of  the  Pharmacopoeia, 
measure  the  magma,  and  add  to  every  4  volumes  1  volume  of  strong 
alcohol ;  then  add  of  this  mixture  sufficient  to  the  percolate,  obtained 
as  above,  to  deprive  it  of  its  cincho-tannic  acid.  The  absence  of  the 
latter  is  readily  ascertained  by  the  addition  of  a  drop  of  muriated 
tincture  of  iron  to  a  filtered  portion  of  the  liquid,  which  should  not 
be  colored  by  such  addition.  Should  coloration  result,  the  intensity 
or  faintness  will  serve  as  a  guide  to  the  further  addition  of  the  ferric 
oxide.  As  soon  as  de-tannation  is  effected,  filter  the  whole  through  a 
double  muslin  cloth,  express  the  residue  under  a  press,  filter  this  por- 
tion, add  to  that  first  obtained,  and  measure  the  united  filtrate.  Add 
to  the  residual  magma  on  the  cloth  sufficient  of  the  above-described 
mixture  of  alcohol  and  water  to  make,  when  again  expressed  and  fil- 
tered, the  united  filtrates  measure  3  gallons.  Now  triturate  2  flui- 
drachms  of  fresh  oil  of  orange  with  4  troyounces  of  prepared  chalk, 
incorporate  this  with  the  3  gallons  of  de-tannated  "cinchona  liquor,'^ 
and  agitate  occasionally  for  24  hours,  and  then  filter. 
The  "  cinchona  liquor  "  so  obtained  is  just  twice  the  strength  of  the 
"  elixir  of  calisaya  above  referred  to,  and  when  mixed  with  an  equal 
volume  of  "  improved  syrup  of  the  hypophosphites  with  iron  "  forms 
the  "elixir  of  calisaya  with  hypophosphites.'^ 
VII.  Elixir  of  calisaya  and  hypophosphites  ivith  strychnia  may  be 
made  by  dissolving  1  grain  of  strychnia  by  the  aid  of  a  few  drops  (or 
just  sufficient)  of  hypophosphorous  acid  in  1  fluidrachm  of  distilled 
water,  and  adding  sufficient  of  the  above  elixir  (VI)  to  make  1  pint. 
A  dessertspoonful  contains  -^-^  grain  of  strychnia. 
Acid-proof  Cement. — One  part  of  caoutchouc  and  two  parts  of 
linseed  oil  are  melted  together  and  the  mass  thoroughly  mixed  with 
sufficient  white  bole  until  the  proper  consistence  is  obtained.  This 
cement  becomes  somewliat  softer  by  heat,  is  not  attacked  by  hydro- 
chloric; or  nitric  acid,  and  does  not  readily  harden ;  to  facilitate  the 
latter  it  may  be  mixed  with  oue-fifth  litharge  or  red  lead. — Folyt. 
Notizbl, 
