144 
On Modes of Comparing ilie 
Number 
of Roots 
Specific 
Specific 
oi' each 
Gravity. 
Gravity. 
Difference. 
size 
Large. 
Small. 
weiglietl. 
/ ]/ vn7 Q — 
X I III if-y • 
4 
Green round 
854 
920 
+ GG 
Q 
o 
IT UI niC-HJUlJCll * . ■ 
4- 1 1 • G 
Q 
KJi ccii lunucii • • • 
SL'i rviiifr'c 
OIVll VllJ^ o ■ • « • 
070 
934 
— ^G 
c 
12 
Average .... 
/l//7 >l/7/l//"/- 1/1 3/7* , 
i/UVJ u 
— 1 n • 1 
•~ 1 U X 
3 
Lang red .... 
lOOG 
984-3 
-21-7 
3 
Red globe .... 
998 
1013-5 
+ 15-5 
3 
Yellow globe . 
1014-2 
1014-9 
+ •7 
3 
Sugar beet .... 
Yellow globe 
1023 
1049-8 
+ 2G-8 
G 
1015 
1029-8 
+ 14-8 
18 
Average .... 
1011-8 
1020-3 
+ 8-5 
These results are irregular : whether this arises from acci- 
dental imperfections in the roots weighed, or from the peculiar 
habits of the plant, is impossible to say. The number of roots 
weighed are by no means such as to justify any sort of positive in- 
ference. 
Anotlier subject of comparison presented itself as to the pro- 
bable efTect of exposure on the upper as compared with the lower 
part of the same root, with reference to the question of earthing 
up for protection. The roots were cut in two at the line marked 
by the surface of the soil, and each part weighed — 
Number 
of each 
Specific 
Specific 
Diflereuce. 
Gravity. 
Gravity. 
part 
weiglieJ. 
Upper half. 
Lower part. 
Turnips. — 
3 
Green round . , 
881 
921 
40 
Man(inld-wur~c! . — • 
*Long red .... 
♦Red globe .... 
3 
955 
1014 
59 
3 
9G3 
1001 
38 
3 
* Yellow globe . 
979 
1017 
38 
G 
Do. do. large 
1009-3 
1U22-9 
13-G 
6 
Do. do. small 
Swedes. — 
1024 
1038-7 
14-7 
6 
Skirviiig's, large 
9G4 
988-4 
24-4 
6 
Do. small . 
951 
979 
28 
* All these were roots of 1841, and had been left in a dry room before 
