Grouping comprehensively some geological facts bearing on the duration of the great creative periods, I note (1.) Vast strata of rock-formations, widely diverse from each other, too diverse to have been formed under the same circumstances and conditions of our globe. Some――the lowest in relative position――appear to have been once in a state of fusion under intense heat, while others――in general all the higher rocks――seem to have been deposited under water. Mineralogically, these rocks differ from each other very widely and also from the fused rocks.――――(2.) Again, some are manifestly composed of fragments of pre-existing rocks, broken off and worn by long-continued attrition and then compacted――known as pudding-stone――the breccias.――――(3.) Yet again; immense strata of these intermediate and higher rocks contain fossil organic remains, some of vegetables, others of animals or of both, and also in very great variety. More marvelous still; they are found occurring in groups, bearing a well defined relation to each other, so that one strata of rock contains species of vegetables and also of animals in a measure adapted to each other, and adjusted to the condition of the earth’s surface and climate at one and the same time. Another strata shall contain a different group, to some extent new and yet not altogether so, but lapping on with some of the earth’s old inhabitants reproduced, and omitting other species.――――(4.) Again, immense beds of coal are found, undoubtedly of vegetable origin, differing somewhat widely from each other as having been formed from diverse vegetable and forest material, and under various degrees of heat and pressure. No small amount of time must be given for the growth and deposition of these mountain piles of tree and fern.――――The charring of these coal-pits of nature was provided for in the “fervent heat” of the earth just below the surface, coupled with pressure brought upon them it would seem by convulsions and upbreakings, to which the earth’s crust has been many times subjected.――――(5.) Limestone, largely of animal origin, demands in like manner time for the growth of the animals whose shelly incasements, accumulating age after age, have made such ample provision of limestone and of lime for the use of man. This list of nature’s facts as the practiced eye reads them from the crust of our earth does not claim to be exhaustive. If it were all, however, it would still be amply sufficient to sustain the demand for long creative periods as opposed to ordinary human days. It should not be forgotten that this demand, coming forth from the facts developed in the crust of the earth, falls in most fully with what we have seen to be the legitimate construction of the Mosaic record. _Prominent points of harmony between Genesis and Geology._