is given just below [Equation (4)] in the Appendix. It acts at
above the base, since the distribution of stress on
is linear.
It follows, because [Equation (7)] is the usual one for the thrust of non-coherent earth of depth
, that the total horizontal stress on
of the earth endowed with cohesion, is exactly the same as that due to the same earth, but devoid of cohesion, having a free horizontal surface,