Am.  Jour.  Pharm.l 
April,  1887.  J 
Antiseptic  Cottons  and  Gauzes. 
175 
ton  thus  prepared,  has  the  acid  intimately  incorporated  into  its  fibres 
and  is  free  from  loose  particles  of  crystals  among  its  meshes. 
Boric  acid  80  gm.  (2  oz.  av.  and  360  grs.) 
Boiling  water    1814  gm.  (4  lb.  av.) 
Absorbent  cotton  453-5  gm.  (1  ft),  av.) 
Dissolve  the  acid  in  the  boiling  water,  impregnate  the  cotton,  ex- 
press and  dry  by  exposure  to  the  air  or  slight  heat.  Borated  cotton 
thus  made  contains  exactly,  in  the  finished  product,  15  per  cent,  of  its 
weight  of  acid.  The  use  of  a  Troemner  solution  balance,  will  great- 
ly facilitate  the  weighing  of  quantities  in  this,  as  well  as  in  all  other 
formulas  herein  given. 
Benzoated  Cotton. — As  benzoic  acid  is  soluble  in  15  parts  of  boiling 
water,  the  same  general  method  followed  in  the  case  of  borated  cotton, 
can  here  be  duplicated  ;  using,  in  addition,  a  small  percentage  of  glyc- 
erin to  prevent  separation  of  crystals  in  the  finished  product.  The 
strength  is  15  per  cent,  of  acid. 
Benzoic  acid  ,  90  gm.  (3  oz.  av.  76  grs.) 
Boiling  water  1814  gm.  (4  lb.  av.) 
Glycerin    57  gm.  (2  oz.av.) 
Absorbent  cotton  453.5  gm.  (1  lb.  av.) 
Proceed  as  before. 
Salicylated  Cotton.  This  is  generally  made  10  percent,  in  strength, 
with  water,  alcohol  and  a  small  proportion  of  glycerin  to  prevent  the 
shaking  out,  after  drying,  of  the  crystals  contained  in  the  interstices  of 
the  fibres.    The  following  is  the  formula  used  : 
Salicylic  acid   57  gm.  (2  oz.  av.) 
Alcohol  453*5  gm.  (1  ft>.av.) 
Hot  water  2268  gm.  (5  lb.  av.) 
Glycerin   57  gm.  (2  oz.  av.) 
Absorbent  cotton  453-5  gm.  (1  lb.  av.) 
Mix  the  acid,  in  a  porcelain  or  wedgwood  mortar,  with  the  glycerin, 
dissolve  with  added  alcohol,  place  the  solution  in  a  large,  flat,  open 
vessel  and  lay  upon  the  surface  of  the  liquid  the  cotton  in  thin  layers. 
After  standing  for  ten  minutes  in  this  liquid  and  absorption  is  com- 
pleted, remove,  express  and  lay  aside  to  dry  upon  a  frame.  The 
method  of  expression  may  be  with  the  use  of  the  hands,  but  a  better 
way  is  between  the  open  rollers  of  a  clothes-wringer  so  provided  that 
they  are  not  too  tightly  screwed  together.  Pilcher  observes,  that  the 
antiseptic  qualities  of  this  cotton  may  be  still  further  enhanced  if  be- 
fore using,  a  thin  layer  of  it  be  dipped  in  a  10  per  cent,  solution  of  the 
