4?o 
Microscopical  Examination  of  Cloves. 
Am.  Jour.  Pharm. 
October,  1894. 
alcohol  was  removed  on  a  water-bath,  and  to  the  nearly  dried  mass, 
from  2  to  2 cubic  centimetres  of  benzoyl  chloride  were  added. 
The  mixture,  in  a  flask  similar  to  that  in  which  the  extraction  had 
been  done,  was  stirred  with  a  glass  rod  until  the  reaction  was  com- 
plete. Water  containing  some  KOH  was  then  added,  and  the  whole 
heated  on  a  water-bath  for  a  few  minutes,  then  removed  and  placed 
in  ice-water,  and,  when  cooled,  the  clear  liquid  decanted,  and  if  there 
were  any  floating  oily  particles,  these  were  removed  in  a  separatory 
funnel  by  means  of  ether.  This  washing  was  continued  three  or 
four  times,  and  finally  the  benzoyl  eugenol  was  separated  from  the 
water  by  means  of  a  separatory  funnel  with  ether.  The  ether  was 
evaporated  off  (assisted  by  siphoning  the  vapor  and  the  use  of  the 
suction  of  air).  The  mass,  on  cooling,  crystallized.  These  crystals 
were  dissolved  in  15  cubic  centimetres  of  alcohol  (90  per  cent.),  heated 
to  solution  and  recrystallized  by  placing  in  ice-water  and  shaking 
the  flask  repeatedly.  The  solution  was  decanted  and  filtered  through 
a  small  filter  from  the  crystals,  and  the  latter  simply  washed  with 
an  additional  15  cubic  centimetres  of  alcohol  (90  per  cent.).  The 
crystals  in  the  flask  with  filter  paper  were  dried  at  1 00°  C,  and 
then  weighed, 
I  gram  eugenol  requires  -341  gram  KOH. 
I  gram  eugenol  requires  -693  benzoyl  eugenol. 
5  cubic  centimetres  alcohol  (90  per  cent)  will  dissolve  -  no  gram 
benzoyl  eugenol. 
C3HS 
KOH  = 
OCH5 
OCH3 
'OK 
Potassium  Eugrecol. 
H20 
CC3H"a 
y 
C3H£ 
OCH3 
+  KC1. 
Potassium  Eugenol.  Benzoyl  Eugenol. 
Thorns  has  worked  out  an  algebraic  formula  for  hastily  calculat- 
ing the  results,  which  may  be  translated  as  follows : 
