ON THE QUANTITIES OF NITRATES STORED IN PLANTS. 473 
in October and taking samples from the field from time to time. 
The dijfere?ices here found were not so large as in the other case , 
where the objects were kept in a state of rest after they had been 
harvested. 
Object. Root of 
Dates of collection. 
Nitric anhydride in 
100 parts of dry 
matter. 
Raphanus sativus . 
15 Oct 
4.80 
99 99 . 
21 „ 
4-13 
99 99 . 
28 „ 
4-77 
99 99 
4 Nov. 
516 
99 99 . 
13 
4.06 
99 99 ... 
25 » 
3-25 (1) 
)) 99 . 
9 Dec. 
2.50 
99 99 .. 
20 „ 
3 34 
99 99 . 
27 Jan. 
2.66 
99 99 . . . 
12 Feb. 
3-50 
99 99 .. 
10 March. 
2.21 
99 99 ... 
29 Apr. 
3-95 
99 99 . 
22 May. 
3-70 
Object. Root of 
Brassica campestris. 
99 
99 
9 ) 
9} 
Dates of collection. 
21 Oct. 
2.27 
28 „ 
2-45 
4 Nov. 
2.36 
18 „ 
2.44 
9 Dec. 
0.67 
20 „ 
1.06 
27 Jan. 
1.09 
12 Feb. 
1.21 
Nitric anhydride in 100 
parts of dry matter. 
(1) Frost had set in. 
(2) This determination was made with a young plant. 
