Am.  Jour.  Pharm. ) 
Nov.,  1881.  J 
Varieties. 
577 
while  hot,  and  set  aside  to  crystallize.  A  fresh  crop  of  crystals  may  of 
€Ourse  be  obtained  by  evaporating  the  mother  liquor. 
The  quantity  of  oxalic  acid  required  cannot  be  definitely  stated,  as 
both  acid  and  carbonate  are  generally  impure;  but,  theoretically,  174 
parts  of  carbonate  should  require  90  of  acid,  and  produce  202  of  neu- 
tral oxalate.  The  product  will  practically  be  always  considerably  less 
than  this,  seldom  equaling  more  than  the  weight  of  the  carbonate 
•employed. 
As  has  been  stated,  the  neutral  oxalate  is  soluble  in  about  three 
times  its  weight  of  water,  and  as  photographers  use  a  saturated  solu- 
tion, there  is  no  reason,  if  time  be  an  object,  why  a  liquor  should  not 
be  prepared  extemporaneously,  or  at  least  that  the  operation  of  crystal- 
lization might  not  be  omitted. 
I  have  found  that  the  specific  gravity  of  such  a  solution  is  at  ordi- 
nary temperatures  1'220,  and  that  ten  ounces  of  the  salt,  when  dis- 
solved, measure  twenty-six  fluidounces.  Such  a  solution,  exce^^t 
made  with  distilled  water,  will  of  course  require  filtering,  as  the  lime 
present  in  ordinary  water  is  precipitated  as  oxalate. — Canad.  Pharm. 
Jour.,  Aug.,  1881. 
VARIETIES. 
Treatment  of  Ringw^orm  of  the  Head. — Dr.  Besnier  recommends 
the  following : 
R    Acidi  boracici,         .  .            .            .    gr.  xv 
Sulphur,  sublimat.,  .            .            .  .       gr.  xv 
Vaselini,     .            .  .            .  -51 
Olyceroee  of  Thymol.— 
R    Thymol,         .             .             .             .  .1-0 
Glycerin,              ....  25M) 
Alcohol,          ...             .             .  .  2d-0 
Water,  enough  to  make       .            .            ,  500'0 
M. — Useful  in  pityriasis. 
SiMPEE  Bemedy  for  Chafe. — Bathe  parts  well  in  tepid  water,  dry 
well  with  soft  cloths,  and  a^Dply,  by  means  of  a  soft  si)onge  or  cloth,  the 
following: 
R    Ziiici  aeetatis,  .  .  .  .    gr.  xv 
Morphia3  aeetatis,  .  .  .  gr.  ii 
Glycerin,  aq.  rosi^,  .  .  .  .    ««  5ii 
M.  ft.  sol.    Sig. — Apply  to  chafed  parts  twice  or  thrice  a  day. 
Styptic  Colloid.— R  Collodion,  l(JO-0 ;  car) )olic  acid,  lO'O ;  tannic  acid, 
5*0 ;  benzoic  acid,  o'O.   Mix  the  ingredients  in  the  above  order.   It  instantly 
37 
