Am.  Jour.  Pharm. 
June.  1903. 
}  External  Preparations.  279 
their  application,  solutions  of  medicinal  agents,  such  as  belladonna, 
camphor,  etc.,  in  alcohol  or  other  volatile  liquids,  are  no  doubt  more 
effective  when  they  are  applied  by  means  of  an  occlusive  dressing,  as 
shown  by  the  extended  researches  of  Dr.  Thos.  F.  Reilly,1  presented 
to  this  association  in  1900. 
Several  modifications  have  come  into  recent  use  :  the  saponimenta 
or  liquid  medicated  soaps,  which  may  be  prepared  extemporaneously 
from  the  official  soap  liniment  or  from  the  semi-solid  form,  linimen. 
turn  saponatum  camphoratum  of  the  National  Formulary  or  solid 
opodeldoc. 
COLLODIONS. 
The  collodions,  owing  to  the  impervious  film  of  pyroxylin  or  col- 
loxylin  which  they  leave  on  evaporation  of  the  volatile  solvent 
ether-alcohol,  suggest  a  wider  employment,  and  as  being  well 
adapted  for  applications  on  small  areas,  when  lasting  effects  are 
desired  of  tannin,  iodin,  iodoform  and  similar  derivatives.  The  offi- 
cial list  may  well  be  extended  to  include  those  of  the  National  For- 
mulary. 
The  linimenta  exsiccantia,  or  the  so-called  drying  liniments,  have 
somewhat  similar  uses,  except  that  they  do  not  form  so  impervious 
a  coating  as  do  the  collodions,  the  vehicle  consisting  of  mucilages  of 
starch,  dextrin,  tragacanth  or  albumin.  The  following  is  a  type, 
which  may  be  medicated  as  desired  with  zinc  oxid,  chrysarobin, 
iodoform,  ammoniated  mercury,  ichthyol,  salicylic  acid,  etc. 
VERNICIUM  ICHTHYOU  ACUMINATUM,  UNNA. 
R.    Ichthyol  sulph.  ammon  £v  20 
Starch,  powder  3  v  70 
Distilled  water  3  xv  60 
Mix  with  : 
Liquid  egg-albumin,  recent   .  m.  xii 
75 
MODERN  DERMATOLOGIC  PREPARATIONS. 
Pastes  (Pastes — Dermatologic — Lassar,  Unna,  etc.). — These  are 
mixtures  of  starch,  dextrin,  zinc  oxid,  sulfur  or  calcium  carbonate, 
made  into  a  paste  with  glycerin,  soap  or  fat,  such  as  petrolatum  or 
lard,  medicated  with  antiseptic  or  astringent  agents.  The  following 
are  important  examples : 
1  The  Journal  A.  M.  A.,  Jan.  26,  1901,  p.  250. 
