1918.] The Fifth Indian Science Congress. elxxi 
The ripening seed of J a biloba and its septate structure. 
ABHESA 
The noteworthy feature in the se ae of Ipomea biloba is its septate 
structure. The septum is no outgrowth from either the chalaza or from 
any other part of the ovule. Mor rpholo peteally it represents a part of the 
nucellus which, owing to peculiar circumstances, persists even in the 
an se i 
—? a. 
vascular girdle Sites a mediu septum possible, owing to the 
rsistence of w h throughout the pi tee tom oft ha ovule into a seed, 
the seed taki iiss lar 
Preliminary note on a biological and ee study of 
Sepsis pond life of Lahore.—By 8S. L. Guo 
«. Pond life Ee Lohan ra is interesting on account of the river Ravi 
flowing close by ich leaves ponds and pools after the r = ngs 
: e a. pe DR of Lahore are winter, summ 
which vary in temperature, and hu 7? aa the steers neh 
. hree | m 
and systemat tudy. Visits were maid ie nightly and phys iat aad 
vegetative conditions of the ponds recorded. Phytoplankton was col- 
lect ted by means a 
of ane 
..- Investigations carried on so fari show how the vegetation is 
different in beree about the three ponds. x 
‘s uture plan of work consists in regularly watching the t fe 
aay to — vegetation and the changes produced in each pond 
different season 
"asary! forests of Dehra Dun.—By A. Das and P. C, 
NJE I, 
forest 
n oecological sketch indicating the chief characteristics of the 
vegetation of the Dun Swam amps wit th a brief account of the chief factors 
constituting the environment. 
The leaf-trace in Polypodiacee.—By G. 8. CHEEMA. 
l. Different methods of taking out Stele. 
(a) By simple teasing. 
(6) By the use of chemicals. 
2. ne structure and form of leaf-trace examined in :— 
@) Pteris longifolia (L) riginal 
(0) Pteris cretica (L “a . py 4 
(c) Pteris tremula : - Tansle reese 
(d — tenerum (Swartz) .. re ay 
(e Nephrod m sp. (unide ntified) * origin r 
(f Syngramme fr axenia (Don) .. “ ek 
M4 Adiantum capillis veneris (1) .- aa 4 
‘ ontopteris proli, era ee: -* 4 
(6) Cyathea Mavarthert ,. _ Sinnot. 
