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Where the red and blue circles do occur near each other, I am able, in several instances, to show that there have been oscillations of level, subsidence having preceded the elevation of the red spots; and elevation having preceded the subsidence of the blue spots: and in this case the juxtaposition of reefs belonging to the two great types of structure is little surprising.

In a succeeding chapter it will be seen, that we are led to a similar conclusion with respect to the secondary fossiliferous strata of the Cordillera, namely, that they also were deposited during a long- continued and great period of subsidence.

BB, The shores of the fringed island. A'A', Outer edges of the reef, after its upward growth during a period of subsidence, now converted into a barrier, with islets on it. B'B', The shores of the now encircled islands. CC, Lagoon-channel. No theory on the formation of coral-reefs can be considered satisfactory which does not include the three great classes.

During the periods of subsidence, there would probably be much extinction of life; during the periods of elevation, there would be much variation, but the geological record would then be less perfect.

The apostle, in dread of its subsidence, cries out, "Keep yourselves in the love of God." How readily the Church, in interest and zeal, becomes cold. Her spiritual pulse sinks till it is scarcely perceptible; the flames disappear, and the coals lie hidden in their own grey ashes. With such conditions the Lord is vexed. He gently chides His inconstant Bride, saying, "Thou hast left thy first love.

On the first floor two corridors ran backward, branching sharply off and presenting a set of doors to view which were painted yellow and numbered with great white numerals in such a way as to suggest a hotel with a bad reputation. The tiles on the floor had been many of them unbedded, and the old house being in a state of subsidence, they stuck up like hummocks.

They live in His heart, and in due time He will show that He remembers them. The gradual subsidence of the flood is told with singular exactitude of dates, which are certainly peculiar if they are not historical. The slow decrease negatives the explanation of the story as being the exaggerated remembrance of some tidal-wave caused by earthquake and the like.

Originally it was probably a natural subsidence, strengthened by artificial earthworks; and whatever its first use may have been, it became a popular amphitheatre for public performance of miracle-plays. There are many water-mills in this district, and they provide a feature not common in Cornwall. After passing the extensive sands of Perran Bay the coast once more becomes rugged and broken.

Formations rich in fossils of many kinds, and of thickness sufficient to last to an age as distant in futurity as the secondary formations lie in the past, would generally be formed in the archipelago only during periods of subsidence.

At this period, the submarine craters yielded at intervals a prodigious supply of gypsum and other mineral exhalations, and occasionally, in certain places poured forth lavas, chiefly of a feldspathic nature: at this period, islands clothed with fir-trees and composed of porphyries, primary rocks, and the lower gypseous strata had already been locally upheaved, and exposed to the action of the waves; the general movement, however, at this time having been over a very wide area, one of slow subsidence, prolonged till the bed of the sea sank several thousand feet.