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218 to a sloping quay bench (Fig. 116) opposite her windows. She had always remarked, that, at high water, the tide covered to the point $$c$$, or an inch or two above it, prior to



the 16th December; but since that, the high-water level had been permanently about five inches beneath the arris of the quay at $$e$$, giving a difference in level of from nine to twelve inches. To test this I examined the water level daily at the hour nearly of highest tide, and for four days found the highest tide-mark as at $$b$$; but on the next occasion of observation it was not only at $$c$$, but some inches above it. The difference was simply due to the off or on shore wind.

It would be tedious to record several other observations round the bay of like character.

On visiting the Temple of Serapis, at Pozzuoli, where the notoriety it had already acquired on this point, and the daily attention given to it, presented the best chance of decisive indication, no evidence whatever could be found of change of level. The "gardien " of the place, however, on being questioned as to whether he had observed any change of level, at once directed our attention to the base of one of the worm-eaten columns, and stoutly affirmed that the level of the