256 
PLASMA  PLUMBI. 
ter,  and  drained.  It  is  then  dissolved  in  a  strong  acid — sul- 
phuric, for  example — and  re-precipitated  by  the  addition  of  a 
large  quantity  of  water,  or  by  an  alkaline  solution.  The  pro- 
duct is  thus  obtained  sufficiently  pure  for  sale.  For  dyeing 
and  printing,  alcoholic,  acid,  or  aqueous  solutions  may  be  used, 
according  to  the  nature  of  the  article  to  be  dyed  and  the  purity 
of  the  color  required. 
The  next  patents  referred  to  by  the  author  are  those  of  Messrs.^ 
Beale  and  Kirkham,  Mr.  Kay,  Mr.  Price,  and  Mr.  G.  C.  Wil- 
liams, which  have  been  already  described  in  the  Chemical  News, 
(vol.  i.  pp.  9,  74,  81.) 
(To  be  continued.) 
PLASMA  PLUMBI. 
By  Charles  S.  Tilyard. 
Read  before  the  Maryland  College  of  Pharmacy,  Feb.  14th,  1861. 
In  a  former  number  of  the  Journal  the  writer  suggested  a 
combination  of  Goulard's  extract  of  lead  with  glycerine  (gly- 
cerole  of  lead)  as  a  substitute  for  Goulard's  cerate. 
The  fluidity  of  that  compound  has  been  found  an  objection 
to  its  application  in  some  cases,  and  has  led  him  to  modify  it  by 
combining  the  extract  with  plasma.  The  result  is  a  preparation 
of  the  consistence  of  an  ointment  which  may  be  modified  at 
pleasure  by  increasing  or  diminishing  the  quantity  of  starch  or 
arrow  root. 
Take  of  Glycerine,    ....       2  fluid  ounces. 
Sol.  subacetate  of  lead,        .        .  3  "  drachms. 
Camphor,       .        .        .        .10  grains. 
Bermuda  arrow  root,  .        ,  li  drachms. 
Ilab  the  arrow  root  into  a  fine  powder  and  having  mixed  the  gly- 
cerine and  extract  of  lead,  stir  it  into  the  mixture.  Pour  the 
whole  into  a  capsule  and  heat  over  a  spirit  lamp  cautiously,  con- 
stantly stirring,  until  it  becomes  transparent,  and  assumes  the 
consistence  of  paste.  Having  powdered  the  camphor  by  means 
of  a  few  drops  of  alcohol,  rub  a  little  of  the  plasma  with  it  in 
