370 
Analysis  of  Bar  ley. 
j  Am.  Jour.  Pharm. 
t       July,  1884. 
ally.  It  was  thrown  upon  a  filter  and  thoroughly  washed  with  warm 
water,  and  then  diluted  to  600  Cc.  This  extract  contained  all  the 
starch  of  the  barley  as  glucose.  Fehling's  solution  showed  the  pre- 
sence of  6*293  Gra.  of  the  sugar,  and  with  Sachsse's  test  30*186  Gm. 
Hgl2  were  reduced.  As  starch  and  dextrin  are  isomers,  the  same 
change  took  place  as  was  explained  under  the  cold  water  extract. 
180  :  6-293  ::  162  :  x  =  5*664  Gm.,  the  amount  of  starch  in  10  Gm. 
barley. 
Weight  of  the  insoluble  portion,  when  dried,  1*664  Gm.  Total 
acid  extract,  therefore,  5*774  Gm.,  and  of  acid  extract  not  starch, 
0*11  Gm. 
Alkali  Extract. — On  boiling  the  above  remainder  for  two  hours  with 
100  Cc.  of  a  20  per  cent,  solution  of  sodium  hydrate,  filtering,  and 
washing  with  sufficient  water  to  remove  the  alkali,  the  residue  after 
drying  weighed  0*746  Gm.,  making  the  alkali  extract  0  918  Gm.,  con- 
sisting of  proteids  and  ash. 
The  residue,  0'746  Gm.,  consisted  of  crude  fibre  and  ash.  To  find 
the  amount  of  pure  cellulose  it  was  macerated  for  24  hours  in  a  solu- 
tion of  chlorinated  soda,  washed,  dried  and  weighed.  Weight,  0*744 
Gm.  The  ash  was  estimated  by  igniting  the  above  in  a  weighed  cru- 
cible and  weighing  the  portion  not  consumed.  Ash,  0*024  Gm. ;  pure 
cellulose,  0*72  Gm. 
On  summing  up  the  results  of  the  different  operations,  the  follow- 
is  produced : 
Moisture  
Ash  
Proteids  
Fat,  Resin,  etc. 
Volatile  Oil  
Cane-sugar  
Dextrin  
Starch  
Cellulose  
Calculated  as 
free  from 
moisture. 
11-68 
2-68 
3-03 
12-99 
14-70 
5'65 
6-39 
0-69 
0-78 
1-02 
1-15 
1-85 
2-09 
56-64 
64-13 
7-20 
8-15 
100-40 
100*42 
