1922, ] Indian Science Congress. L.8.C. 149 
doss milis at J debulpete & abe gedaan saute “of this, The gases can 
also be profitably used for working a gas engine to drive dynamos for 
ea taba ity. 
The sewage effluent and gases after treatment have been found to be 
odourless 
he conditions necessary for such a process of aves disposal are 
as follow 
ly The fi ad system must be a separate and on a combined 
(2) There aboela be no open house drains where igs oe 
ibbish and olhes foreign substances enter the s 
(3) There shoal be as little silt or foreign substances a 2 ‘poealts 
in the se of ‘‘ Natrani’’ traps so as to 
or 
oO 
a 
t being oe chemically if precipitan 
(6) fee, supervinin o sewe ystem is essential and 
should be di rents towards electively preventing the i ingress 
excess into the s 
and as qui chig ak pal 
Section of Anthropology. 
President :—Rat BanapuR Hirawat, B A., M.R.A:S. 
Presidential Address. 
THE ABORIGINES OF CenTRAL INDIA. 
‘he most wonderful bare in this rear ’s programme is the 
he Science Con- 
unscientific class, the district officer, 
was the first problem which confronted me, when I first heard 
of it, but I have found a solution to what appeared irrecon- 
cilable i in the beginning. The Executive Committee were wise 
pe, 
Successor will be a rival of Mr. Roy. In inst gah ee dn 
interposition, as you will admit, was very necessary. 
have, therefore, no cause to be d isappointed if you gars sa 
light and no science in what I am me to read to you a 
some of the Central Indian Tribes. iad’ 
It has become a fashion to talk of various waves 0 
