and Experiments on the Keeping Qualities of Roots. 
173 
grains of dry organic matter, and with it, 18'8 grains of 
nitrogen, and 29 grains of mineral matter, which accumulated in 
the tops together with some organic matter taken from the 
atmosphere, and some mineral matter drawn from the soil. 
The third swede, planted on the 19th of March, and weighing 
at that time 2 lbs. 1$ ounce, was pulled up on the 15th of 
May, and analysed the same day. At that time the bulb, weigh- 
ing 2 lbs. 1^ ounce, and the tops 10k ounces, had the following 
composition : — 
Composition of Swede on the 15th of May. 
Bulb. 
Tops. 
Water .. .. .. .. 
Non-nitrogenous organic constituents 
89-85 
1-G9 
7-78 
•68 
82 -GO 
4-15 
11-60 
1-G5 
100-00 
100 00 
•27 
•66 
On the same assumption as before, the third swede would have 
contained before planting : — 
Grains. 
On the 15th of May was found : — 
In Bulb. 
In Tops. 
Total dry organic matter in bulb and tops 
„ nitrogen „ „ 
„ mineral matter „ „ 
Grains. 
1370 
39 
98 
Grr 
2C 
0£ 
] 
Grains. 
723 
30-3 
76 
ins. 
93 
1-3 
.74 
In the third period, the swede had thus lost 491 grains of dry 
organic matter ; or about one-fourth of the total amount of 
dry organic matter found in the root on the 19th of March, had 
by the 15th of May migrated into the tops, which during the 
same time assimilated 232 grains of organic matter from the con- 
stituents of the atmosphere, and drew 55 grains of additional 
mineral matter from the soil in which the root was planted. 
