156 
DR. DAUBENY ON THE ACTION OF LIGHT UPON PLANTS, 
The fourth series, with leaves of Tussilago hybrida, in water of temp. 70°, gave the 
following results. 
Proportion between 
Proportion per cent. 
Proportion be 
Proportion be- 
Media through which the light 
the whole quantity 
between the oxygen 
tween the oxy- 
tween the nitro- 
was transmitted. 
weather. 
of gas obtained in 
and nitrogen in the 
gen in the two 
gen in the two 
the two jars. 
two jars. 
jars. 
jars. 
Jar 1. 
Transparent glass. 
Sultry 
100 
0.45 
N. 55 
100 
100 
Jar 2. 
Glass No 5. (Orange.) 
day. 
56 
0.41 
N. 59 
51 
60 
Jar 1. 
Transparent. 
Ditto. 
100 
0.445 
N. 55-5 
100 
100 
Jar 2. 
Glass No. 4. (Red.) 
49 
0. 61 
N. 59 
67-5 
39 
Jar 1. 
Transparent. 
Ditto. 
100 
0.62 
N. 38 
100 
100 
Jar 2. 
Glass No. 3. (Blue.) 
41 
0.33 
N. 66 
22 
72 
Jar 1. 
Transparent. 
Ditto. 
100 
0.54 
N. 46 
Jar 2. 
Glass No. 2. (Purple.) 
10-7 
Jar 1. 
Jar 2. 
Transparent. 
No. 1. (Green.) 
Ditto. 
100 
14 
0.53 N. 47 
0. none, or 
barely any. 
Jar 1. 
Jar 2. 
Transparent. 
Bottle No. 6. containing 
the copper solution. 
Ditto. 
100 
21 
0.50 
0. 13 
N. 50 
N. 87 
100 
5-5 
100 
20-5 
Fifth Series, with leaves of Cochlearea Armoracia immersed in water having a 
temperature of 72 °, gave the following results. 
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 glass .... 
Bright 
100 
0. 57 
N. 43 
100 
100 
Jar 2. 
No. 5. (Orange) 
sunshine. 
Th. 80°. 
75 
0. 54 
N. 46 
71 
80 
Jar 1. 
Transparent 
100 
0. 57 
N. 43 
100 
100 
Jar 2. 
No. 2. (Blue) 
.L/lLLO . 
24 
0. 27 
N. 73 
11-4 
40 
Jar 1. 
Transparent 
100 
0. 57 
N. 43 
100 
100 
Jar 2. 
No. 5. (Green) 
UlllO. 
14-5 
0. 20 
N. 80 
5-25 
26-8 
Jar 1. 
Transparent 
100 
Not measured. 
Jar 2. 
No. 4. (Red) 
15 
O. 31 
N. 69 
Jar l. 
Transparent 
100 
0. 52 
N. 48 
1000 
100 
Jar 2. 
No. 3. (Purple) 
36 
0. 35 
N. 65 
24-2 
48 
Jar 3. 
No. 1. (Green) 
Ditto. 
20 
0. 16 
N. 84 
6-2 
35-2 
Jar 4. 
No. 6. (Bottle xvithl 
12 
0. 5 
N. 95 
1-2 
22-5 
copper solution) . j 
N.B. In another experiment with No. 6. no gas at all was collected. 
