442 
WRIGHT : FOLIAR PERIODICITY 
To further prove the effect of external forces on foliar 
periodicity I need only draw up a tabulated list showing 
the behaviour of species quoted by Ursprung for various 
parts of the world and the same species at Peradeniva 
Species. 
Ursprung. 
Peradeniya. 
Ficus infectoria ... India. Throws off large Markedly decidu- 
quantity of leaf ous. 
Ficus glomerata ... India. Evergreen ... Deciduous. 
Ficus elastica ... Evergreen ... Partially deciduous. 
Anona reticulata, Leafless in dry season ... Evergreen. 
Mart. 
Persea gratissima, 
Gaer. 
Thespesia populnea, 
Corr. 
Erythrina velutina, 
Willd. 
In tropical America, ever- Evergreen with one 
green with two conspi- period of active 
cuous periods of leaf leaf production 
production. In Mexico, in April, 
evergreen with develop- 
ment of young leaves 
in September. In 
Mexico there is no rain 
from October to April, 
plenty of rain May to 
September 
East Indies. Evergreen... Evergreen. Par¬ 
tially deciduous 
in Gulf of 
Mannar. 
In Venezuela, leafless Leafless January 
during September and to March. 
October 
Variation of Individuals of a, Species in the same Climate . 
A glance at the tabulated periodicities will convince any¬ 
one of the great individual variation, particularly in speci¬ 
mens of Bridelia retusa, Careya arborea, Ficus Arnottiana, 
Lagerstrœmia flos-reginæ, Bombax malabaricum, Oroxylum 
indicum, Berrya Ammonilla, and many others. 
The differences between the periodicities of several trees 
of Lagerstrœmia flos-reginæ are shown in the tabulated list. 
Generally speaking, defoliation at Peradeniya is conspicuous 
during January and February, and in March new leaves 
appear. Nevertheless on any date during the months of 
March and April it is possible to find trees which show 
