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These examples indicate how the history of the phylogenetic experiences of the human race may be learned by a study of the position and the action of the nociceptors, just as truly as the study of the arrangement and variations in the strata of the earth's crust discloses to us geologic history.
So that if we could reverse the legend of the Seven Sleepers, if we could sleep back through the past, and awake a million ages before our own epoch, in the midst of the earliest geologic times, there is no reason to believe that sea, or sky, or the aspect of the land would warn us of the marvellous retrospection.
It is urged that whatever may be thought of the connection of man with the animal creation, at any rate the received Christian belief regarding the origin of man especially his late appearance on the scene is contrary to known facts, and that we have to mount up to a vast geologic antiquity to account for what is known from exhumed remains in caves and lake dwellings, and the like.
The general editorial supervision is exercised by the Chief Clerk of the Survey, Mr. James C. Pilling. In organizing the general geologic work, it became necessary, first, to consider what had already been done in various portions of the United States; and for this purpose the compilation of a general geologic map of the United States was begun, together with a Thesaurus of American formations.
The primary factor is the inherent tendency to development. The origin of species is on a scale of time of enormous magnitude. What takes place among our domestic animals of a summer day is by no means a safe guide as to what befell their ancestors in the abysses of geologic time.
For instance, you have only got to think of evolution as divided into moral, astronomic, geologic, biologic, psychologic, sociologic, aesthetic, and so forth, and you will find that there is always an evolution of the parts into which it divides itself, and that therefore there is but one evolution going on everywhere after the same manner.
You are both such good listeners that it is a pleasure to talk to you, but I want you to promise to interrupt me with questions whenever you wish anything more fully explained." We promised to do so, and Thorwald began: "Our world is very old. The geologic formations tell us of a time when no life could exist long ages of convulsion and change in the crust of the globe.
At the outset of his studies, therefore, the physical geologist had to choose between two hypotheses; either, throughout the ages which are represented by the accumulated strata, and which we may call 'geologic time', the forces of nature have operated with much same average intensity as at present, and hence the lapse of time which they represent must be something prodigious and inconceivable, or, in the primeval epochs, the natural powers were infinitely more intense than now, and hence the time through which they acted to produce the effects we see was comparatively short.
Southern Jersey was in short an island with a sound behind it very much like the present Long Island. The shoal and island had been formed in the far distant geologic past by the erosion and washings from the lofty Pennsylvania mountains now worn down to mere stumps. The Delaware River flowed into this sound at Trenton.
The way in which this creature, weak in body and exceedingly dependent on his surroundings, has in the modern geologic epoch come forth from the mass of the lower animals, is by far the most impressive and as yet the most unexplained phenomenon which the geologist has to consider.
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