ON  FLUID  EXTRRCT  OP  YARROW.  437 
result  will  be  obtained  by  burning  carbonate  of  zinc  in  a  porce- 
lain dish  over  a  moderate  coal  fire.  The  burning  in  a  glass 
matrass  will  be  preferred,  after  some  practice,  over  all  other 
methods  ;  giving  the  result  in  less  time,  less  loss  by  dusting 
away,  and  no  danger  of  the  oxide  being  injured  by  dust  and 
other  impurities.  Whenever  carbonate  of  zinc  is  edulcorated 
with  water  until  the  salts  of  baryta  no  longer  produce  any  re- 
action with  it  and  then  burned,  after  burning  we  see  the  reac- 
tion again  taking  place,  though  often  only  slightly,  but  always 
more  or  less.  Mohr,  therefore,  recommends  to  rub  down  the 
oxide  of  zinc,  with  a  little  distilled  water,  to  a  fine  pulpy  mass, 
and  to  edulcorate  it  with  hot  distilled  water,  until  no  longer  any 
reaction  takes  place.  Furthermore,  this  has  the  effect  of  divid- 
ing and  separating  all  those  small  lumps  and  granules  generally 
produced  by  the  burning ;  and  the  preparation,  after  being 
dried  again,  will  have  a  finer  appearance  and  be  considerably 
whiter  than  before.-—  Journ.  Trans.  Md.  Col.  of  JP harm.,  June, 
1859. 
FLUID  EXTRACT  OF  YARROW. 
By  Chares  Tilyard. 
Having  been  requested  by  a  medical  friend  to  make  for  him 
(for  use  in  his  own  case)  some  condensed  form  of  the  herb,  and 
inasmuch  as  no  preparation  of  the  kind  was  obtainable,  I  was 
induced  to  experiment  for  the  purpose ;  the  result  was  the  pro- 
duction of  an  extract  satisfactory  to  him,  beneficial  in  his  own 
case,  and  in  the  case  of  others  for  whom  he  has  prescribed  it. 
Yarrow,  though  heretofore  used  in  domestic  practice  only,  and 
then  in  the  form  of  an  infusion,  possesses  properties  sufficiently 
medicinal  and  valuable  to  warrant  it  in  assuming  its  proper  place 
among  officinal  preparations. 
The  Physician  above  referred  to  informs  me,  that  it  possesses 
tonic,  astringent  and  expectorant  properties  to  a  degree  not 
generally  known  to  the  profession,  and  which  requires  in  his 
estimation,  more  attention  than  has  heretofore  been  bestowed 
upon  it. 
The  following  is  the  plan  I  have  adopted,  as  producing  after 
several  trials,  the  most  satisfactory  results.  Take  of  Yarrow 
(the  recently  dried  herb)  in  coarse  powder  eight  ounces,  (offici- 
