488 MR. J. B. LAWES, DR. GILBERT, AND DR. PUGH ON 
Tasie I1.—Showing the amount and the composition of the Gas given off by 
plants, in the shade, into a Torricellian vacuum. 
Deserinti | Total Per cent. 
escription. Gas 
Date. collected, Castoamt Onygen 
cub. ||Nitrogen.| Oxygen. sie aga | ee 
Part of Plant. How manured, &e. cents. acid. || Carbonic 
acid. 
Wheat; 1858. 
{ 
Mineral manure.........cc.ecctceeseeee 77:72 2-28 0-00 22-28 
{Mineral manure,........:..sceseerecees ! 77-94 5-06 7:00 22-06 
} June 16.) Whole plant i : 
‘...{Mineral and Ammoniacal manure |! 57-0 78:60 | 1-75 19-65 || 21-40 
55-7 
EB 
June 17.| Whole plant .... 
June 16.) Whole plant .... 
June 16.) Whole plant .... 
June 16.} Whole plant 
.|Mineral and Ammoniacal manure 77:38 3:23 19-39 22-62 
Mineral and Ammoniacal manure 82°50 0:30 17:20 17:50 
Barley; 1857. 
June 24.) Whole plant .......... ee (UTHATAINE. ..caninanmennommarnonciesinna 8-6 85:12 | 3-93 10°95 14:88 
June 24.| Whole plant .............044 ai Nd Unmanured ......:..6000 0s Hewaieasnnnin 20°9 81-48 | 1:97 16-55 18-52 
Beans; 1858. 
June 17.|Whole plants coming into Flower [Unmanured  ...........seseeeeese ween 543 7974 | 516 15-10 || 20-26 
June 17.|Whole plants coming into Flower |Unmanured .............. wef 415 86:74 | 4:10 9:16 || 13-26 
52:5 80:38 4:38 15-24 || 19-62 
June 17.|Whole plants coming into Flower |Ammoniacal manure 
50-4 84:33 | 4:36 11:31 || 15-67 
June 17.|Whole plants coming into Flower |Ammoniacal manure 
Clover; 1857. 
47:7 85-61 6-00 8:39 14:39 
Aug. 10,| Beas scream nconwarvesnaeain net Unmanured 
Aug. 10./Stems and Leaves .... ...|Unmanured 59°8 83:23 2-33 14:44 16°77 
Ang: Th. Heads ssssasecsexvenaanis ...{Unmanured 91:0 87-15 1:89 10:96 12:85 
Aug. 11./Stems and Leaves ..0......6.cc0008 Unmanured 42-3 78°32 1-31 20°37 || 21°68 
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. 
Experiments, 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 purpose. 
