140 HOW CROPS GROW. 
From the above table we gather:— 
1, That different plants yield different quantities of ash. 
It is abundant in succulent foliage, like that of the beet, 
(18 per cent,) and small in seeds, wood, and bark. 
2. That different. parts of the same plant yield unlike 
proportions of ash. Thus the wheat kernel contains 2 per 
cent, while the straw yields 5.4 per cent. The ash in su- 
gar-beet tops is 17.5; in the roots, 4.4 per cent. In the 
ripe oat, Arendt found (Das Wachsthum der Hafer- 
pflanze, p. 84,) 
In the three lower joints of the stem.... 4.6 per cent of ash 
In the two middle joints of the stem.... 5.3“ cs 
In the one upper joint of the stem...... oe « 
In the three: lower leaves..s2....< s+ +.<ee/e 10.ds 9 pss ce 
In the two upper leaves... ....5...0..< 1O:5* ess BS 
TRS OX CAT i; 5:0 21m, 5:00 aro aYatelaveisi casi etalsieeie ee ete 2: 0m nce ss 
3. We further find, that in general, the wper and outer 
parts of the plant contain the most ash-ingredients. In 
the oat, as we see from the above figures of Arendt, the ash 
increases from the lower portions to the upper, until we 
reach the ear. If, however, the ear be dissected, we shall 
find that its outer parts are richest in ash. Norton found 
In the husked kernels of brown oats.-.. 2.1 per cent of ash 
In the husk of brown oats........-.000 8.2.77 ss < 
In the chaff of brown oats...........e.. 19:1 © 
Norton also found that the top of the oat-leaf gave 16.22 
per cent of ash, while the bottom yielded but 13.66 per 
cent. (Am. Jour, Science, Vol. 3, 1847.) 
From the table it is seen that wood, (0.3 to 2.7 per cent,’ 
and seeds, (1.5 to 3.7 per cent,) (lower or inner parts of 
the plant,) are poorest in ash. The stems of herbaceous 
plants, (3.7 to 7.9 per cent,) are next richer, while the | 
leaves of herbaceous plants, which have such an extent of 
surface, are the richest of all, (6 to 8 per cent.) 
4, Investigation has demonstrated further that the same 
plant in different stages of growth varies in the propor 
