*
407
diminishing gradually at every
sub.
posit
:: sequent blow until at lash a
was reached when it became impor- sible, in spite of long continued, of fort and by increasing the drop to four pet, to penetrate any purchér This point is represented by the line
shewn in Each Cross Section marked Briefly des
Surface of hard ground.
-cribed the fouredate
foundation may
be said
to be a soft sandy mnd passing down by almost imperceptible gradations of
moderately compact. clay and thence into a hard clay until the extremely hard gravelly-
density into a
or rocky bed is reached, the depth
this hard bed below the surface of
of
the soft mund being anything between
2 feet and 30 feet (vide Cross Sectiond, indicated that no soft seams
The
borings
underlay harder strata, ir uo
clay
permeated.
F