364 
ON  SPURIOUS  LEMON-JUICE. 
method  of  preparing  the  above  named  article  will  yield  a  good 
result  from  a  certain  quality,  and  be  without  any  effect  at  all, 
upon  trial  of  another.  Among  the  many  ways  proposed  for 
the  preparation  of  Mel  Despumatum,  the  following  process,  to 
judge  from  various  scrutinous  experiments,  appears  to  promise 
the  most  favorable  result : — 
Mohr  recommends  to  treat  the  honey  under  process  of  refine- 
ment, with  a  solution  of  tannin,  or  an  infusion  of  nutgalls, 
which,  with  some  kinds  of  honey,  will  be  found  very  practi- 
cable ;  in  other  cases,  however,  it  will  not  produce  a  clear  solu- 
tion. The  application  of  tannin  will  work  in  this  way  :  by 
heating,  it  will  coagulate  with  the  gelatine  contained  in  the 
honey ;  and  the  turbid  substances  will  separate  with  the  coagu- 
lum. 
In  some  instances,  however,  clarification  will  not  take  place, 
and  this  will  invariably  be  the  case  with  the  better,  and  conse- 
quently purer  qualities  of  honey,  which  contain  too  little  gela- 
tine to  effect,  with  the  tannin  added,  a  coagulum.  Now,  to  effect 
the  desired  result,  I  proceeded  in  the  following  manner  : — 
I  dissolved  twenty  ounces  of  honey  in  double  the  quantity  of 
water,  and  added  to  this  turbid  solution  twenty-four  grains  of 
gelatine  dissolved  in  a  few  ounces  of  water.  To  this  fluid,  after 
being  well  mixed,  I  added  seven  grains  of  tannin  previously  dis- 
solved in  a  little  water ;  the  whole  was  then  again  well  stirred 
and  exposed  to  the  heat  of  a  steam  or  sand  bath.  It  was  then 
set  aside  until  cold,  when  I  added  the  white  of  two  eggs  beaten 
into  a  good  lather,  and  then  finally  boiled  it  up  once  or  twice 
on  an  open  fire,  which  effected  a  perfect  coagulation  of  the  tur- 
bid slimy  matter.  The  fluid  should  now  be  strained  through  a 
woolen  cloth,  and  poured  back,  until  it  runs  bright  and  clear,  or 
it  can  be  filtered  through  thick  blotting  paper.  It  should  be  re- 
duced, by  evaporation,  to  twenty  ounces.— Journ.  and  Trans. , 
Maryland  Col.  JPharm.,  June,  1858. 
ON  SPUMOUS  LEMON-JUICE. 
By  H.  Sugden  Evans. 
The  chairman  next  introduced  the  subject  of  the  quality  of 
lemon  juice  supplied  to  emigrant  and  other  ships  sailing  from  the 
