‘Fea er 
IN A SATURATED ATMOSPHERE, : 303 
leaf &c. could be weighed while still remaining within the glass 
jar. A layer of water covered the bottom of the jar; and a wet- 
and a dry-bulb thermometer were suspended within it; the 
mercury was always exactly at the same height in both of them. 
The jar was either exposed to diffused light, or else entirely 
excluded from light by means of oiled cloth. 
The following is a selection of experiments to represent three 
types of foliage. 
In the following cases, selected out of several, it will be 
observed that as long as the plants were exposed to diffused 
daylight, they continued to lose weight, although the atmosphere 
was apparently perfectly saturated all the time *. 
Buxus sempervirens. 
ME Loss per cent. | Temp. (W. & D.). 
July 9th. o 
8 A.M. 3240 .| | ç ... 67 
3 P.M. 3:155 973 71 
5, 3:085 :321 73 
10 , 3:035 1:626 69 
July 10th. 
, 8 a.m. 3:045 t 032 67:5 
lpm. 3:035 032 71 
10 „ 3:005 098 71 
July 11th. = 
8 A.M. 9:115 t :366 70 
E 6 P.M. 2-950 5:296 75 
uly 12th. 
8 A.M. 2-965 + 050 7 1 
1 Ps. 2-965 000 71 
6 „ 2:945 -067 72 
10 ,, 2:955 t 033 70 
July 13th. 
8 AM. 2-980 T 084 nr 
2 P.M. 2:955 *083 e 
5.30 P.M. 2:905 *016 
Jot 10 p.m. 2-920 t 051 67 
uly 14th. 
8 aM. 2:940 41:369 66 
6 P.M. 2-925 5:102 69 
July 15th. 
4 8 A.M. 2-960 11:196 ad 
ji 6 PM 2-950 034 
16th. 
d res 2-960 t 036 67 
* The reader’s attention is called to the instances of no loss by a * and 
a t represents a gain. In all other instances the numbers represent a loss 
per cent. of the entire weight of the leaves under examination. 
4 
