of  the  Ashes  of  Plants. 
505 
The  samples  were  taken  from  the  standing  crops  at  harvest  time, 
being  cut  off  close  to  the  ground. 
Mr.  Eggar  carefully  determined  the  relation  of  grain,  straw, 
and  chaff ; and  as  these  results  may  he  of  value  for  other  pur- 
poses besides  the  comparison  of  the  ash  analyses,  we  subjoin 
them : — 
Relative  proportion  of  straw  and  chaff  to  grain  in  three  specimens  of 
Barley : — 
No.  1. 
No.  2. 
No.  3. 
Grain 
, . . iono 
• . 
1000  • 
• 1000 
Straw 
. . . 985 
• • 
12‘28  • 
• 730 
Chaff  . , 
. . . 1C7 
• • 
184  • 
. 200 
For  the  ash  analysis  the  straw  and  chaff  were  burned  sepa- 
rately ; but  the  analysis  was  made  upon  the  ash  of  both  mixed  in 
the  proper  relative  proportions. 
Per  centage  of  water  and  ash  in  Barley: — 
Water. 
Ash. 
Ash  calculated  on 
dry  substance. 
c i * 
■g  i 2 
5 S 
Cliaff. 
Grain. 
Straw. 
I Chaff. 
Grain. 
Straw. 
fc: 
5 
O 
No.  1.  Chevalier  Barley  1 
on  loamy  soil  . . J 
No.  2.  Chevalier  Barley  1 
on  chalk  . . . j 
No.  3.  Long-eared  Not-1 
tingham  Barley  oil  > 
chalk  . . . . J 
9-209-50 
11-10 8-58 
9-209-22 
10-28 
10-81 
9-99 
2-07 
2-13 
1-99 
4-97 
3-34 
2-81 
11-45 
0-iS 
0-77 
2-28 
2-39 
2-20 
5-49 
3-65 
3-09 
12-55 
6- 93 
7- 52 
The  per  centage  of  ash  in  the  grain  is  very  similar  for  the  three 
specimens,  but  in  the  straw  and  chaff  the  variation  is  consider- 
able. The  straw  and  chaff  of  No.  1 greatly  exceed  in  quantity 
of  mineral  matter  those  of  Nos.  2 and  3. 
For  analysis  the  straw  and  chaff  ash  were  mixed  in  proper 
proportions;  but,  in  order  to  understand  the  results,  we  must 
determine  what  per  centage  of  ash  the  mixed  straw  and  chaff 
would  afford.  This  is  easily  ascertained  bv  a calculation  founded 
upon  the  relations  of  straw  to  chaff  before  given. 
Without  introducing  the  calculation  here,  it  may  be  sufficient 
to  give  the  results.  The  mixed  straw  and  chaff  contain — 
No.  1.  No.  2.  No.  3. 
5*91  ••  3*71  ••  3*22  per  cent,  of  ash. 
