488 
ME. J. B. LAWES, DE. GILBEET, A^B DE. PTJGH ON 
Table II. — Showing the amount and the composition of the Gas given otfby 
plants, in the shade, into a Torricellian vacuum. 
Date. 
Description. 
Total 
Gas 
collected, 
cub. 
cents. 
Per cent. 
Nitrogen. 
Oxygen. 
Carbonic 
acid. 
Oxygen 
and 
Carbonic 
acid. 
Part of Plant. 
How manured, &c. 
Wheat; 1858. 
June 16. 
Whole 2 )lant 
Mineral manure 
570 
77-72 
2-28 
20-00 
22-28 
June 17 . 
Whole plant 
Mineral manure 
55-3 
77-94 
5-06 
17-00 
22-06 
June 16. 
'Whole plant 
Mineral and Ammoniaoal manure 
57-0 
78-60 
1-75 
19-65 
21-40 
June 16. 
WJiole plant 
Mineral and Ammoniacal maniu’e 
55-7 
77-38 
3-23 
1939 
22-62 
June 16. 
Whole jdant 
Mineral and Ammoniacal manure 
65-7 
82-50 
0-30 
17-20 
17-50 
Barley; 1857. 
Unmanured 
8-6 
85-12 
3-93 
10-95 
14-88 
Jime 24. 
Whole plant 
Unmanured 
20-9 
81-48 
1-97 
16-55 
18-52 
Beans; 1858. 
June 17 . 
Whole plants coining into Flower 
Unmanm-ed 
543 
79-74 
5-16 
15-10 
20-26 
June 17 . 
Wdiole plants coining into Flower 
Unmaniu’ed 
41-5 
86-74 
4-10 
9-16 
13-26 1 
June 17 . 
"Wliole plants coining into Flower 
Ammoniacal manure 
52-5 
80-38 
4-38 
15-24 
19-62 
June 17. 
WTiole plants coming into Flower 
Ammoniacal manure 
50-4 
84-33 
4-36 
11-31 
15-67 1 
1 
Clover; 1857. | 
Aug. 10. Heads 
Unmanured 
47-7 
85-61 
6-00 
8 39 
14-39 
Auer. lO.lSteTns fliifl 
Unmanured 
59-8 
83-23 
2-33 
14-44 
16-77 
Aug. 11. 
Heads 
1 91-0 
87-15 
1-89 
10-96 
12-85 
Aug. 11. 
Stems and Leaves . 
Unmanured 
1 42-3 
78-32 
1-31 
20-37 
21-68 1 
These experiments also tend to show that the reducing-power of certain of the 
carbon compounds of the plant was sufficient to convert nearly all the oxygen (or ozone) 
present into carbonic acid, when in the shade. 
The next point is to consider how far the conditions are favourable to the oxidation 
of Nitrogen in the vegetable organism, when the plant is subjected to the action of the 
direct rays of the sun. 
Experime^its, Series 3. 
In these experiments, in which over 100 exhaustions were made, the operation was 
conducted precisely as in the case of the last experiments, with the exception that the 
plants were exposed during the whole process to the direct rays of the sun. The 
following Table exhibits a few of the results obtained, which are sufficient for our 
present pm’pose. 
