200

the reagents have all been added, shake each Lube Urn times and
f* fiiw :uid flu* order in which the turbidity of the liquid disappears.
the ,sh:ikiriK until Lite time of clearing is (established for eae.h oom-
n«!«led. Xot.(» what ion or iotm appear to be the most effective in
fioi'ruhition of the .soil parti(dc;s in l)oth types of soils.