Nutritive Values of different Crops. 
143 
both. It is to be presumed that the plant requiiinn^ the richest 
soil is that which will yield the greatest nourishment ; and, if so, 
the above figures indicate a specific weight corresponding with 
the higher nutritive powers of the Welsh kidney. The difference 
is certainly not great, the Welsh kidney giving only about 20 in 
1000 more than the rohan; but the separate tubers from which 
the averages were taken, as well as the two years, gave remark- 
ably uniform results. 
o 
Nufritious 
limber 
Roots 
'eighed 
Specific 
Gravity. 
Average 
•Specific 
Gravity. 
Ingredients in 
moo lbs. 
An.-ilysis. 
■A ' 
Herapath. 
In Turnips, the 
889 
905 
3 
3 
Pomeranian globe averaged ■ 
Green round , , . 
1 908-67 
White turnip, 
42 
3 
Border imperial , , 
In Swedes — 
932 
6 
Purple- topped) From Mr. 
Green , , J Pusey's farm. 
949 
1 957-67 
Swede, 
6 
952 
64 
12 
In Mangold u urzel — 
972 
G 
' ) From Mr. 
Ked globe , [ „ , ,. 
1' 11 11 V"useysiarm. 
» oliow globe r o I -1 
r, , , 1 .Sandy soil, 
fsugar beet J •' 
995-5 
C 
1005-9 
Orange globe, 
6 
1014-55 
1 1015-97 
135 
6 
1036-6 
Sugar beet, 
146 
12 
Yellow globe. Stone brasli . 
I022'15 
These differences may appear small — that in the potato, be- 
tween the heaviest and the lightest sorts, being only 26 ; in the 
turnip 43, in the swede only 23, and in the mangold wurzel 41 — 
but it does not follow that the difference in nourishment is only 
in the same ratio ; for the difference between the average specific 
gravity of the turnip and the swede was only 61, while their nutri- 
tive ingredients were 42 and 64. So the difference in the specific 
gravities of the mangold wurzel and the potato was only 79, but 
the nutritive ingredients were 136 and 274, the equivalents 397 
and 200, and the nitrogen, as indicating nourishment, was 260 and 
370. So that, though the actual difference in their specific gravi- 
ties may be small, it seems probable they indicate greater dif- 
ferences in nourishment. 
A comparison also was made of large and small roots, its object 
being to find out whether wide planting and large roots materi- 
ally diminished density. The results were as follow :— 
