o
\
,
,
f,
:
.
,
.
,
.
-2‘
,
"'
'
l\l
'\
.
.
'
'
‘
»
‘
'
In the Institute of Environmental Education Summer Study Program, students and
teachers examined a whole range of water pollution problems. Above, some equipment devised and built by students; below, students count bacteria colonies to develop a profile of stream pollution.
'
.
…
,
…
,
*"
.«
ÿ, .…
*
'
,
,
\
.
\
\
.
.
\\
\
°
\
,
&
”…
,
\ _ «
\
-
=f
ë.“
’
;‘. ,\‘—
_»
"
;«
\
\
Ï.æ
_
>
\
\
..
ï*
“
;
——
‘
.
s
.
.
.—Ï
‘
\.
_
“î
_
…
,
\\
’
.
.
.
à;
—..
,
.
.
_,
—
'\
.
'
_
…
_
..
.
‘
‘
.—
»
'.<
-
’
.
‘
-\.-—
.
-.
'.
il.
‘
.-.r:.«...
‘
*
’
a...
'
*
.
..
.
»
-
‘—..—.
x—