AND OF PLANTS UPON THE ATMOSPHERE. 
153 
The first plant operated on was the common Cabbage ( Brassica oleracea ) ; and as 
some of the results obtained in this instance appeared anomalous, in as much as they 
indicated an evolution of pure nitrogen, which I have detected in none of my other 
experiments, three or more trials with each kind of glass were in this instance had 
recourse to. The following were the results obtained. 
Media through which the light 
was transmitted. 
State of 
the 
weather. 
Proportion between 
the whole quantity 
of gas obtained in 
the two jars. 
Proportion per cent, 
between the oxygen 
and nitrogen in the 
two jars. 
Proportion be- 
tween the oxy- 
gen in the two 
jars. 
Proportion be- 
tween the nitro- 
gen in the two 
jars. 
Jar 1. Transparent window-glass 
Exp. 1. 
Bright 
sunshine. 
Jar 1. 100 
Jar 2. 80 
0.44 N. 56 
0.40 N. 60 
100 
77-5 
100 
86 
Jar 2. 
Type 
Glass No. 5. (Orar 
r y s 
ige.) 
Exp. 2. 
Bright 
sunshine. 
Jar 1. 100 
Jar 2. 82 
0. 33 N. 66 
0.33-4 N. 66-6 
100 
80 
100 
83 
Exp. 3.* 
Bright 
sunshine. 
Jar 1. 100 
Jar 2. S3 
0.0 N. 100 
0. 0 N. 83 
Jar 1. 
Jar 2. 
Same as before. 
Glass No. 4. (Crimson- 
coloured.) 
Exp. 1. 
Bright 
sunshine 
with a 
few fleecy 
clouds. 
Jar 1. 100 
Jar 2. 45 
0.37 5 N. 62-5 
0.33-3 N. 66-6 
100 
40 
100 
48 
Type 
A 
r y g 
Exp. 2. 
Strong 
bright 
sunshine. 
Jar 1. 100 
Jar 2. 54 
0.39 N. 61 
0.38 N. 62 
100 
52-5 
100 
55 
Jar 1. 
Jar 2. 
Same as before. 
Glass No. 3. (Dark blue.) 
Exp. 1. 
Sunshine 
with 
partial 
clouds. 
Jar 1. 100 
Jar 2. 57-5 
0.33 N. 66 
0.34-6 N. 65-4 
100 
56 
100 
56-5 
Type 
r y s 
Exp. 2. 
Bright 
sunshine 
without 
clouds. 
Jar 1. 100 
Jar 2. 57-5 
0.33-3 N. 66-6 
0. 30-2 N. 69-8 
100 
70-5 
100 
53-5 
Jar 1. Same as before. 
Jar 2. Glass No. 2. (Purple.) 
Exp. 1. 
Sunshine 
without 
clouds. 
Jar 1. 100 
Jar 2. 47 
0.38-4 N. 61-6 
0.30 N. 70 
100 
35-4 
100 
51 
Type 
r y g i v 
Exp. 2. 
Sunshine 
more ob- 
scured 
than in 
Exp. 1. 
Jar 1. 100 
Jar 2. 31-4 
0.25 N. 75 
0.22 N. 78 
100 
27-7 
100 
26-6 
* N.B. The leaves in this latter case were quite fresh, and had not been previously immersed in water. 
MDCCCXXXVI. X 
