1919.] The Sixth Indian Science Congress. CXXXVii 
asurements are made at the + page of — air, viz. 
—190°C and at various pressures between 25 mm. and 350 the quan- 
tities of hydrogen adsorbed, at these eis Pressure, by 100 sq. em. of 
rtz surface, and r educed to N.T.P., being 2-0 c.mm. and 10°5 c.m 
ve 
It is observed that rq scuetey low pressures there is a finite adsorp- 
tion of 2 c.mm., and it i nrg eon this effect is similar to the effect 
of fixed adsorption in the 6 e of char Ds 
The results of these pened aieesesiaps e used in the calculation of the 
necessary correction to a hydr ogen gasthermometer made out of quartz : 
p 90°C the magnitude 
of the correction is very 8 mall. 
imilar experiments are being continued on nitrogen and other gases 
and at various othas tempera 
A note on the inna power of cocoanut charcoal.— By 
H. KB. Wat 
ts | I made to determine the amount gas adsorbed 
by diate of ppg charcoal made at various tempera 
An apparatus has been designed suitable for a oid test for com- 
mercial purpo oy 
It is found tha a adsorption of a a weight of charcoal increases 
with the temperatur which it is made, that is to say it increases as 
the quantity of volute matter decre a. 
Derivatives of gallic eg. eaten note.—By R. L. 
ALIMCHANDANI and A. N. MELDRU 
Section of Zoology and Ethnography. 
President—F.M. How:tet, Esq., B.A., P.E.S. 
Presidential Address. 
Post-War ZooLoey. 
(With Plate I.) 
I feel, as I stand here and try to look as much like the 
President of the Section of Zoology and Ethnography as pos- 
sible, very much. like an impostor. For I have been engaged 
coats future tendencies of zoology as a whole. 
About “post-war Zoology,” then, you know at least as 
much as I can ever pretend to do, but ith is a subject which is of 
such _ pene importance—as we already know from C 1. 
of animals—and especially of inucialniide ean h 
there is another set of no less definite shaiaaae characters. 
That each order, family. genus, and species has an individuality 
