186 
May 18—6.30-5.30—Dull, 
May 6—6.30-9.30—Bright. cold, wet. 
11.30—Bright, close .., | Slight scent. 11.30—No scent. 
2.30— _,, a trong. 
2.30— 2? ” 
5.30— ,, aN _ 3.30—Slight scent. 
5.30— 2 ” 
May 20—Dull, showery. No scent before 2 p-m. and then only 
slight, 
The conclusions arrived at are as follows. On bright days the 
scent is strongest from 2.30 p.m. to 5 p-m., and then gradually 
diminishes. On dull days the scent is not so strong as in bright 
weather, and exhalation begins later. 
€ morning is wet and cold, and the afternoon bright, 
the scent develops later and apparently remains later. 
Flowers picked off and kept at a rather higher temperature on 
aper become scented about an hour before those left on the tree. 
With the object of obtaining further data as to the influence of 
external conditions on the production of scent by the flowers of 
Michelia, some experiments were made in the Jodrell Laboratory. 
Cut flowers, with their stalks placed in water, were used, and in 
most cases four lots of three or four flowers each were arranged 
under different conditions, e.g., one set of flowers in the dark, 
one in shade,* another in sunlight, and another in a very damp 
he experiments were mostly begun soon after 10 a.m., the 
flowers being then without scent. The earliest development of 
Scent was observed shortly before 11 a.m. 
Similarly treated specimens from a batch of flowers of 
Damp air, as compared with dry, causes earlier exhalation of 
t. This was tested in sunlight and in shade, and the 
hai and from half-an-hour to two hours in the shade. The 
avourable influence of moisture was shown also by the fact that 
amp air gave a greater proportion of ses pte and also of 
al ; 
sia’ the shade experiment the flowers were placed close to a north 
€ flowers in this case were SO ich the air 
: : put under a small bell-jar in which t 
was kept near saturation-point by means of damp blotting-paper. 
