438 WRIGHT: FOLIAR PERIODICITY 
leaf before the end of April. Yet at Buitenzorg this species 
commences to drop its old leaves in July, five to six months 
after those in Ceylon. 
Almost the same dissimilarity is Been in the (all of old 
leaf of Erythrina indica, at Peradeniya in January and 
Febrnary, and at Buitenzorg in July. This variation is 
analogous to the great differences in time between the 
periodicities of trees at Peradeniya and in the Province 
of Uva, and is all the more interesting on account of the 
act that the species concerned are common in both 
islands. 
There are several species which have been introduced 
to Java from Ceylon and to both islands from other 
zzzszzzr in their foiiar “ ies 
betoourlfsch 081 ! eXampleS is 86e “ “ «» 
less^for two treG behaVe in different ways, some being leaf- 
Other equally noteworthy instances are seen in «. 
obviou 8 wh e none^r tieS i,° f °* h “ weU 'hnown species are 
the Bo-tree, drops B ““ enz ° rs > Ficna «!#<>««, 
flos^eginae in September “ “ d Werstroemia 
