From the sketch we have thus far drawn of the Miocene Age, it seems to have been a very favorable one in every respect. One writer41 affirms, that “the world never experienced a more beautiful period.” And indeed it seems as if the facts bear out this statement. A genial, temperate climate was the rule, even to high northern latitudes. We need not doubt but that there were grassy plains, wooded slopes, and rolling rivers. Was man present to take advantage of all these favorable surroundings? Did he wander through the evergreen forests, and hunt the deer, antelope, and hogs—the hipparions, and mastodons, and deinotheres—then so numerous?42 We know of no inherent improbability of his existence at that time. An ape belonging to a highly organized genus was then living in Europe. Every condition considered necessary for the primeval Garden of Eden was then satisfied. Let us stop for a minute and examine the nature of the evidence considered sufficient to prove the presence of man during any of the past geological ages. Should we be so fortunate as to find portions of the bones of the human skeleton in a geological formation in such positions that they could not possibly have been introduced there since the deposition of the containing bed, it would of course prove that man was at least as old as the formation itself. But it happens that human remains in beds of a previous geological age are very rare. Indeed, human remains in formations of the Pleistocene Age,43 during which we have ample testimony, as we shall see, of the presence of man, are very rare. The cases in which there can be no doubt can be reckoned on the fingers. The explanation of this state of things is not at all difficult, for it is only under very rare circumstances that portions of the bones of animals even larger than man are preserved to us in geological strata. Vast numbers die and vanish away without leaving a trace behind them for every fragmentary bone we recover. In the case of man we must remember that, in previous eras, he was present in very small numbers; that, owing to his intelligence, he would not be as liable to be drowned and swept away, and so mingle his remains with beds of river detritus then forming, as were animals. Mr. Lyell has made some remarks on the draining of the Haarlem Lake by the government of Holland in 1853, which shows that even favorable circumstances do not always preserve remains for future inspection. Though called a lake, this body of water was an arm of the sea, covering about forty-five thousand acres. The population which had lived on the shores of the lake was between thirty and forty thousand souls. “There had been many a