79
foundation of pierre perdue, for no stones appear under the footings the latter having been laid doubt at extraordinary low tides on the natural surface itself. But
spite of the reassur
in
-stance
sunk
circum_
reassuring the old wall not having where it was any where
of
to obtain a
necessary knowledge of the sub . - stratum which supported it, the four portions at Cross Sections 31,
41 have been taken.
35, 40 and
down in lengths varying from 15 to 20 feet, and the footings having been loosened and removed at considerable labour, clusters of borings borings were
made through uniform hand sand and gracel, reaching the nook at the following depths:
depths.
at Cross Section 31 =
8 feet
35.
6
40
"
41
//
The Geological nature of the bottom
in
4.0
paries
ww.y
from that which has been described in
the
preseding
Section A. hor have random borings taken at distances of from
15 lo
30 feet out, along the entire length, revealed any dangerous inter layers
seams of sand or to slide over
clay liable
one another. It should. also be pemarked in regard to the pubble said to have been
plm..
along the toe that the absence of any indication of under wash along the wall after typhoons cannot be
dul