141 
ON  GLYCERIN. 
Freshly  precipitated  carbonate  of  iron  ; 
Most  of  the  metallic  oxides  to  some  extent ; 
Nitrate  of  potassa,  silver,  copper  and  lead ; 
Citrate  of  iron,  citrate  of  iron  and  quinine,  citrate  of  iron 
and  strychnia,  tartrate  of  iron  and  potassa ; 
Pyrophosphate  of  iron,  and  most  saline  substances. 
Heating  to  give  it  greater  fluidity  will  generally  increase  its 
solvent  property. 
It  may  not  be  amiss  to  name  other  purposes  for  which  gly- 
cerin is  largely  used.  Much  the  largest  quantity  used  for  any 
one  purpose,  except  that  of  filling  gas  meters,  is  in  the  manu- 
facture of  hair  oils,  tonics  and  washes,  for  which  it  is  admirably 
fitted,  taking  the  place  of  alcohol  and  castor  oil,  which  are  now 
too  expensive  for  the  purpose,  and  by  its  undrying  property 
keeping  the  hair  moist  in  appearance. 
It  is  largely  used  in  tobacco,  and  is  particularly  adapted  to 
the  article  known  as  fine-cut,  preserving  it  in  a  moist  state  an 
indefinite  length  of  time ;  and,  unlike  sugar,  molasses  and  in- 
fusion of  liquorice,  which  has  been  used  for  the  same  purpose, 
it  will  not  turn  sour,  and  is  unchanged  by  exposure  to  the  air. 
Wine  and  liquor  manufacturers  use  it  to  improve  liquors,  by 
giving  body  and  removing  the  fiery  taste. 
It  is  used  by  manufacturers  of  woollen  goods  in  place  of  oil, 
being  more  economical  and  not  requiring  soap  to  wash  it  out. 
Manufacturers  of  cotton  goods  use  it  in  size  to  prevent  rapid 
drying. 
Printers  use  it  in  place  of  molasses  to  make  rollers,  which 
will  not  dry  and  shrink. 
k  It  is  used  by  artists  in  clay  and  plaster  of  Paris,  to  preserve 
it  in  a  plastic  form  for  modelling. 
It  is  used  in  soaps. 
For  filling  wet  meters,  used  in  measuring  illuminating  gas, 
it  is  now  extensively  used,  and  possesses  decided  advantage 
over  whisky  or  any  substance  before  used  for  the  purpose.  It 
is  practically  free  from  any  objection,  not  evaporating  at  any 
ordinary  temperature,  and  can  be  sufficiently  diluted  to  prevent 
its  absorption  of  more  water  from  the  gas,  and  not  liable  to 
