188 
was not developed by the flowers placed in the dark. By 8 p.m. 
it had practically ceased in both lots of flowers exposed to the 
light, and entirely before 9:p.m. The three lots were then put 
into an oven with a temperature of 92°-100° I’., and kept there 
until 1] p.m., but in no case was any scent developed, 
An interesting feature was noticed in some of the experiments. 
When the same flowers were used on two successive days, it was 
found that an after-effect of the behaviour of the flowers on the 
first day may sometimes be recognised on the second day. For 
instance, in one experiment, flowers placed in sunlight became 
strongly scented, while others placed in the dark produced no 
scent. Qn the following day both lots were exposed to sunlight, 
Tn explanation of this phenomenon it js suggested that possibly 
a non-volatile substance, which yields the scent under certain 
external conditions, accumulates gradually (or chiefly during the 
might) in the cells, but ‘becomes exhausted during energetic 
t 
The exhalation of scent probably takes place chiefly through 
the stomata of the perianth-leaves, but, in view of the favourable 
effect of damp air, it is maintained that the manufacture and not 
only the exit of the scent is concerned in the phenomena observed. 
XXXV.—DECADES KEWENSES 
PLantakum Noyarum in HERpario Hortr Ree 
CONSERVATARUM., 
DECAS LXXXIX., 
881. Rosa (Cinnamomeae) elegantula, Rolfe; 
sertatae, Rolfe, ramis juvenilibus copiose et gracili 
et floribus duplo minoribus facile distinguenda, 
Tutee ramosus, Mediocris; ramuli subglabri, saepissime 
ropiose -aculeati, rarius subinermes. Folia conferta, 5-8 cm. 
affnis 2. 
ter aciculatis 
6 eceptaculum anguste ovoideo-oblongum, _ laevé; 
uibate longum. alycis lobi ovato-lanceolati, caudato- 
minati, interdum Subfoliacei, puberuli, minutissime ciliolati, 
rerissime glandulosi, circiter 1 em. longi, patentes. Petala late 
Gordata. Filamenta glabra, 2-3 m ‘longa antheris aureis- 
Styli villosi, in columnam 2 mm. longam cohaerentes. 
