Having already discussed the contents, the distribution, and general facies of the widely-spread deposits of Eastern England, which together make up the series classed as Glacial beds, namely, the Post-Tertiary clays, sands, and gravels which have been supposed to attest an Ice period ; and also set out the reasons why, to myself and perhaps to others, the attribution of the surface-beds to such an origin is irrational and impossible (irrational because the theory involves our overlooking nearly every feature of these beds in order that we may explain one or two difficulties in them; and impossible because, so far as ice can be judged by the tests of ordinary mechanics, it is incapable of performing the kind of work which has been demanded of it by those who explain these beds by the intervention of ice in any form)—I will now turn to one element in the beds which still remains to be examined, namely, the foreign stones.