m WRIGHT : FOLIAR PERIODICITY 
Nature of defoliation and foliar renewal,—Thu species 
may be classified into three groups. 
The first group comprises those species which become 
absolutely leafless, typical examples being Allseanthus 
zeylamcns, Thw., Canarium zeylanicum, Bl., Canthium 
macrocarpum, Thw., Holarrhena mitis, Br., Pericopsis 
Mooniana, Thw., Terminalia parviflora, Thw. 
These species may undergo complete defoliation before any 
new leaf-trade appear, though this behaviour is rarely as 
conspicuous as m indigenous forms. The actual length of 
trate durragwhmh they are leafless is very limited, and may 
> pa lcular species, from 31st January to 17th Feb- 
^ th to 20th March, and 29thAugust to 
Sfc7m? m r6qUir6d lOT * com plete renewal of foliage 
hfZ~ l0nger - ofCanariumzeylanicum 
cent T y C0mmence t# “ ™ flf 3rd February and 
“^;r n \Ti^bV ri2thMa,oh ’ w “‘ ree 
28th March anrl’tL T 1 af " buds a PP ear fr °m the 20th to the 
“vt n a a 6 ? * outfit of mature 
“cuetLrl r; Similarly for trees of Allman thus 
March, and with Ten^ 6th Januar r to the 17th 
to 29th March. One ^ 1<Hh Febrnary 
P*ete defoliation ZT,™* '* aM 
in 1902. 1 W ' thlD the “°nth of March 
s-™-srs.-: 
duction of new leaves on L “ ’ at “™ 1 of the pro- 
old leave, havefaur »f the tree before all the 
