496 
Notes  on  Carbolic  Acid. 
(  Am.  Jour.  Pharm. 
t    Nov.  1, 1871. 
litharge  to  settle ;  then  pour  off  the  fluid,  and  spread  upon  calico 
to  the  proper  thickness.  The  plaster  made  in  this  way  can  be 
spread  by  machine  and  kept  rolled  in  stock,  and  if  in  a  well-fitting 
tin  canister,  will  retain  its  virtues  for  any  length  of  time. — Lister. 
21.  Antiseptic  Lac  Plaster. — Shellac,  3  parts ;  crystallized  carbo- 
lic acid,  1  part.  Heat  the  lac  with  about  one-third  of  the  carbolic 
acid  over  a  slow  fire  till  the  lac  is  completely  melted ;  then  remove 
from  the  fire  and  add  the  remainder  of  the  acid,  and  stir  briskly  till 
the  ingredients  are  thoroughly  mixed.  Strain  through  muslin,  and 
pour  into  the  machine  for  spreading  plaster,  and  when  the  liquid  has 
thickened  by  cooling  to  a  degree  ascertained  by  experience,  spread  to 
the  thickness  of  about  one-fiftieth  of  an  inch. 
Afterwards,  brush  over  the  surface  of  the  plaster  lightly  with  a  so- 
lution of  gutta  percha  in  about  30  parts  of  bisulphide  of  carbon. 
When  the  sulphide  has  all  evaporated,  the  plaster  may  be  piled  in 
suitable  lengths  in  a  tin  box,  without  adhering,  or  rolled  up  and  kept 
in  a  canister. — Lister. 
22.  Antiseptic  Cere-Qloth. — Cloth  or  thin  calico  is  saturated  with 
cerate  (made  after  the  following  formula),  by  simply  drawing  a  por- 
tion through  it  while  in  a  fluid  state,  or  in  pieces  of  any  length  and 
width,  by  rolling,  by  means  of  a  machine,  the  calico  over  cylinders 
containing  cold  water,  as  fast  as  it  has  taken  up  the  cerate. 
A.  Strongest  Qerate. — Calvert's  pure  carbolic  acid,  liquefied,  3 
fluidounces  ;  olive  oil  (colored  red  with  alkannet  root  to  distinguish  the 
cerate),  1 J  fluidounces  ;  yellow  wax,  liquefied,  1 J  fluidounces  ;  paraf 
fin,  liquefied,  6  fluidounces.  Mix. 
B.  Medium  Strength. — Pure  carbolic  acid,  2  jluidounces  ;  olive  oil, 
2J  fluidounces ;  yellow  wax,  2J  fluidounces ;  parafiin,  5  fluidounces. 
—Mix. 
(7.  Weakest. — Pure  carbolic  acid,  IJ  fluidounce ;  olive  oil,  1  fluid- 
ounce  and  6  drachms ;  white  wax,  1  fluidounce  and  6  drachms  ;  paraf- 
fin, 7  fluidounces.  Mix. 
23.  Antiseptic  Muslin  G-auze. — Paraffin,  16  parts ;  resin,  4  parts  ; 
crystallized  carbolic  acid,  1  part.  Melt  together.  Cheap  muslin 
gauze  is  dipped  in  the  melted  mass  and  well  wrung  or  pressed  while 
hot.    A  good  substitute  for  oakum  as  an  antiseptic  covering  for 
