AMFeJbOU?;r87lRM'}  Preparation  of  Carbolized  Resin  Cloth.  79 
of  chloride  of  ammonium  have  been  added,  5  parts  of  iodide  of  pot- 
assium are  dissolved  in  5  parts  of  water,  and  the  solutions  are  mixed. 
It  will  be  seen  that,  in  this  way,  9  parts  of  water  suffice  for  solution, 
while,  otherwise,  at  least  70  would  be  required.  This  is  a  great  con- 
venience, especially  when  large  quantities  are  operated  upon ;  but, 
according  to  trials  which  I  have  made,  the  method  is  not  economical, 
on  account  of  the  biniodide  being  soluble  in  the  solution  of  chloride 
of  ammonium.  By  draining  the  newly  formed  salt,  as  soon  as  depo- 
sited, the  loss  may  be  rendered  smaller  than  if  water  were  at  once 
added  to  the  mixture ;  but  the  product  will  not  exceed  6*150  parts 
against  6*701,  the  theoretical  yield,  or  6-700,  the  yield  by  the  method 
with  simple  water.  In  large  operations,  some  of  this  dissolved  binio- 
dide may  be  recovered  by  evaporating  to  dryness  the  drainings  and 
first  washings,  washing  away  the  deposited  chloride  of  ammonium, 
and  thus  leaving  the  more  insoluble  biniodide.  The  operation  must  be 
performed  quickly,  or  the  biniodide  will  also  dissolve.  Williams' 
method  cannot  be  recommended  except  where  expedition  and  conve- 
nience are  paramount  considerations  to  that  of  cost.  The  product  is 
of  a  darker  color  and  more  granular  than  by  other  methods,  and 
somewhat  resembles  that  prepared  by  the  old  Edinburgh  process,  in 
which  the  compound  formed  by  a  direct  union  of  mercury  and  iodine 
is  dissolved  and  crystallized  from  a  solution  of  chloride  of  sodium. 
A  word  in  regard  to  Williams'  method  for  purifying  the  green 
iodide  of  mercury.  I  have  lately  tried  this  plan  and  found  it  to  work 
very  satisfactorily,  being  equally  efficient,  quite  as  convenient,  more 
expeditious,  and  much  more  economical  than  the  process  with  alcohol. 
The  washing  may  be  best  performed  by  repeated  agitation  and  decan- 
tation,  using  fresh  solution  of  chloride  of  sodium. — Canadian  Pharm. 
Journ.y  Dec,  1873. 
PREPARATION  OF  OARBOLIZED  RESIN  CLOTH.* 
By  Edward  Lund,  F.R.C.S. 
The  author  having  found  some  difficulty  in  preparing  the  antiseptic 
carbolic  gauze  recommended  by  Professor  Lister  (see  Pharm.  Journ. 
[3]  vol.  iii.,  p.  41)  in  the  way  indicated  by  him,  has  sought  to  modify 
the  process  by  taking  advantage  of  the  property  possessed  by  car- 
bolic acid,  and  first  pointed  out  by  Professor  Lister,  that  it  can  be 
*  British  Medical  Journal,  Dec.  6,  p.  654. 
