In a previous paper of this series I endeavoured to show that the so-called Marine Drifts found at high levels, on both sides of the Irish Sea and elsewhere, are proved by their testaceous contents to have had no connection with the Glacial Age; while the mode of their distribution shows that ice in no form can have distributed them as we find them, nor yet are they consistent with the sub-mergence of the land for any considerable time beneath the sea; and I concluded that the only power known to us capable of distributing them is a wide-spread flood of water. I now propose to carry my argument considerably further, but before doing so, as it is so easy to be misunderstood, I must guard myself against the supposition that in what I have said or mean to say I am minimizing the Great Glacial Age.