IN CEYLON. 
443 
every stage from the discoloured leaves ready to fall to the 
trees in full new leaf and flower. 
Individual trees of Eriodendron anfractuosum show at 
Peradeniya a production of new leaves during the months 
of December, January, and February. 
Bridelia retusa is also very variable. In the Peradeniya 
and Henaratgoda districts the fall of leaf is most con¬ 
spicuous during the months of February and March, but 
many trees of this species undergo defoliation during April 
and May, and in these cases the production of new foliage is 
correspondingly delayed. During February to April, trees 
in the Peradeniya district may be seen dropping their old 
leaves, absolutely leafless or in full new leaf. 
Again Terminalia belerica, though it usually behaves as 
quoted in the list, is subject to some variation. The majority 
of the trees at Peradeniya have shed all their leaves by the 
end of February, and are in full new leaf before the end of 
March. One tree under observation does not drop its leaves 
until a much later part of the year, becoming leafless from 
the 1st to 7th April each year. Others have been recorded 
which do not produce new leaf until the middle of May, 
and some have been observed to shed their leaves, in part, 
during November, December, and January. 
It is only logical to expect much variation between indi¬ 
viduals of the same species in the same climate, seeing that 
even the same tree may show a variation from year to year. 
Variation of the same Tree , in successive Years , in time 
of Foliar Activity . 
The same tree may undergo depletion and renewal of 
foliage at approximately the same time during each year. 
But there are others which are variable. The periodicities 
described for each individual tree of the species common to 
India and Ceylon show that several may exhibit a slight 
inconstancy from year to year, a phenomenon also to be 
observed for species belonging to other countries. The 
