. The testimony of the rocks; . ^t are formed of the Tertiary marine limestones of thecountry; the stones of the pyramids are charged withnummulites, known to the Arabs as Pharaohs beansj Fig. NUM3IULITES L^VIGATA. (Pharaohs Beans.) and these organisms stand out in high relief on theweathered portions of the Great Sphinx. Some of theoldest things in the world in their relation to human his-tory, — erections, many of which had survived the memoryof their founders even in the days of Herodotus, — areformed of materials so modern in their relation to thegeologic epochs, that they had no exis
. The testimony of the rocks; . ^t are formed of the Tertiary marine limestones of thecountry; the stones of the pyramids are charged withnummulites, known to the Arabs as Pharaohs beansj Fig. NUM3IULITES L^VIGATA. (Pharaohs Beans.) and these organisms stand out in high relief on theweathered portions of the Great Sphinx. Some of theoldest things in the world in their relation to human his-tory, — erections, many of which had survived the memoryof their founders even in the days of Herodotus, — areformed of materials so modern in their relation to thegeologic epochs, that they had no existence as rock untilafter the Palaeozoic and Secondary ages had gone by. !Notonly the Carboniferous sandstone of the High Church andParliament House of Edinburgh, but even the Oolitic (thatis, Portland stone) of Somerset House and St. Pauls, areof an antiquity incalculably A^ast compared with the stoneout of which the oldest of the pyramids were fashioned. The second example which I shall adduce is one withwhich many of my auditors must be already familiar. TheFalls of Niagara are gradually eating their way through anelevated tract of table-land, upwards towards Lake Erie, atthe rate of
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