482 
WRIGHT : FOLIAR PERIODICITY 
of all, in the cool moist month of October. 
Variation of the same Tree in Successive Years. 
In the table quoted hereafter it is obvious that there is 
often a fair constancy in the period at which a particular 
tree begins to show discoloured leaves and commences 
defoliation. There is, on the other hand, a considerable 
difference in the length of time during which a particular 
tree may be leafless in successive years. Julostylisangusti- 
folius is an example of one which may not become absolutely 
leafless in a particular year though a leafless phase of several 
days’ duration is what normally occurs. The differences td 
be noted in the synoptical table of dates quoted are not, 
perhaps, entirely due to corresponding differences in climate 
during the years in which the plants in question were under 
observation. 
The relation of Foliar to Floral Periodicities in Deciduous 
Endemic Species. 
Certain species have their foliar renewal closely followed 
or preceded by that of the flowers. Among these may be 
included Allman thus zeylanicus. In this species the flower 
buds appear when the tree has shed only half its leaves, 
and during the time the tree is quite leafless the flowers are 
in full bloom ; only after the new leaves have appeared do 
the flowers begin to wither and drop: a few flowers still exist 
when the tree has regained full new foliage. Canthium 
macrocarpum though bare in February puts on full new 
foliage and also flowers in March, and the full new leaf in 
April on Holarrhena mitis is followed by flowers in May. 
Others produce the flowers long before the old leaves drop 
or after the new leaves have been produced: Julostylis 
angustifolius, Sterculia Thwaitesu, Sapindus erectus, &c. 
These relationships may be better studied in the more 
numerous indigenous deciduous forms. 
