Am.  Jour.  Pbarm. 
August,  1900. 
'•}    Pennsylvania  Pharmaceutical  Association. 
385 
Powder  Folders. 
By  I.  M.  Weills. 
A  description  of  an  original  invention  by  the  author  (see  p.  374 
of.  this  Journal). 
By  Charles  H.  La  Wall  and  Robert  C.  Pursel. 
These  analytical  notes  are  published  on  p.  377  of  this  Journal. 
D.  J.  Thomas  presented  the  following  notes  : 
Ointment  of  zinc  oxide,  prepared  according  to  the  process  of 
the  U.S.P.  of  1890,  will,  with  a  slight  modification,  yield  a  very 
satisfactory  product.  Care  should  be  taken  in  the  selection  of  the 
materials  used  in  the  preparation  of  the  ointment,  and  the  finished 
product  should  always  be  kept  in  a  cool  place  and  never  allowed  to 
be  subjected  to  a  temperature  sufficiently  high  to  liquefy  the  oint- 
ment. Oxide  of  zinc  that  will  stand  the  pharmacopceial  tests,  show- 
ing an  absence  of  contaminating  salts,  should  only  be  used,  but  still 
greater  caution  should  be  exercised  in  the  selection  of  the  lard  for 
benzoination.  Nothing  but  dehydrated  lard  should  be  used,  as  the 
presence  of  water  is  doubtless  the  cause  of  the  granulation  or  de- 
composition of  the  ointment.  The  Pharmacopoeia  suggests  in  the 
preparation  of  benzoinated  lard  the  addition  of  5  per  cent.,  or  more 
if  necessary,  of  white  wax.  To  stand  the  extreme  heat  of  summer, 
it  will  be  found  necessary  to  increase  the  quantity  of  white  wax  to 
10  per  cent.  In  winter,  5  per  cent,  will  be  sufficient.  The  process 
used  by  the  writer,  and  one  which  gives  satisfactory  results,  is  as 
follows : 
Take  of  Ziuc  Oxide  U.S.P  200  grammes. 
Dehydrated  Benzoinated  Lard  ...   800  " 
Sift  the  zinc  oxide  through  a  No.  20  sieve  into  a  porcelain  or 
wedgewood  mortar.  By  means  of  a  water-bath  heat  the  benzoinated 
lard  in  a  porcelain  capsule,  and  while  in  a  melted  state  thor- 
oughly incorporate  it  with  the  zinc  oxide.  Transfer  the  whole  to 
the  capsule,  reheat  it  on  the  water-bath,  and  when  sufficiently 
Laboratory  Notes. 
Formula  for  Zinc  Ointment. 
To  make 
,000 
