Am.  Jour.  Pharm.  \ 
January,  1909.  j 
An  Analysis  of  Cloves. 
9 
while  the  average  total  extract  is  almost  the  same  as  that  given  by 
Moor,  but  some  of  the  samples  show  a  much  higher  total  extract 
than  this  number  and  others  a  much  lower,  so  that  Moor's  number 
cannot  be  taken  as  a  standard. 
The  determination  of  the  "  Oxygen  Equivalent  "  was  carried  out 
by  means  of  Richardson's  method  (U.  S.  Dept.  of  Agric,  Div.  of 
Chem.,  Bui.  13,  page  167),  which  is  a  modification  of  Lowenthal's 
tannin  process. 
It  is  necessary  to  point  out  that  the  quality  of  the  Indigo  used  as 
the  indicator  is  of  very  great  importance,  as  with  inferior  qualities  it 
is  utterly. impossible  to  get  a  sharp  end  point. 
"  Oxygen  As  Querei 
Equivalent."  Tannic  Acid. 
A   2.20  17.13 
B   2.63  20.54 
C   2.52  19.63 
D                                         2.50  J9.47 
F   2.58       '  20.09 
H:   2.56  19.94 
K   2.63  20.54 
M   2.63  20.54 
P   2.63  20.54  . 
Q.                                 2.56  19.94 
R   2.54  1978 
T   2.58  20.09 
Maximum.       Minimum.  Average. 
"Oxygen  Equivalent"   2.63  2.20  2.55 
As  Querei  Tannic  Acid   20.54  17.13  18.19 
Winton,  Ogden  and  Mitchell  give  a  maximum  for  the  "  Oxygen 
Equivalent  "  of  2.63  and  a  minimum  of  2.08,  with  an  average  of 
2.33 ;  and  for  the  Querei  Tannic  Acid  a  maximum  of  20.54,  a  mini- 
mum of  16.25  and  an  average  of  18.19.  The  figures  shown  by  the 
twelve  samples  given  above  follow  very  closely  in  both  cases  those 
of  Winton,  Ogden  and  Mitchell. 
In  conclusion,  the  determination  of  the  Alcoholic  Extract  is  of  no 
practical  value,  the  determination  of  the  Crude  Fibre  and  moisture 
may  in  some  cases  be  of  considerable  use,  whereas  in  others  may 
be  of  no  value  whatsoever;  the  determination  of  the  Ether  Extract 
is  advisable ;  but  undoubtedly  the  three  determinations  upon  which 
the  greatest  reliance  may  be  placed  are  the  determinations  of  Ash, 
Nitrogen  and  the  Oxygen  Equivalent. 
The  University,  Birmingham. 
