Haeckel, discussing this subject, suggests that it is the parvenu in us that is reluctant to own our lowly progenitors, the pride of family and position, like that of would-be aristocratic sons who conceal the humble origin of their parents.  But it is more than that; it is the old difficulty of walking by faith where there is nothing visible to walk upon:  we lack faith in the efficiency of the biologic laws, or any mundane forces, to bridge the tremendous chasm that separates man from even the highest of the lower orders.  His radical unlikeness to all the forms below him, as if he moved in a world apart, into which they could never enter, as in a sense he does, is where the difficulty lies.  Moreover, evolution balks us because of the inconceivable stretch of time during which it has been at work.  It is as impossible for us to grasp geological time as sidereal space.  All the standards of measurement furnished us by experience are as inadequate as is a child’s cup to measure the ocean.

Several million years, or one million years,—­how can we take it in?  We cannot.  A hundred years is a long time in human history, and how we pause before a thousand!  Then think of ten thousand, of fifty thousand, of one hundred thousand, of ten hundred thousand, or one million, or of one hundred million!  What might not the slow but ceaseless creative energy do in that time, changing but a hair in each generation!  If our millionaires had to earn their wealth cent by cent, and carry each cent home with them at night, it would be some years before they became millionaires.  This is but a faint symbol of the slow process by which nature has piled up her riches.  She has had no visions of sudden wealth.  To clothe the earth with soil made from the disintegrated mountains—­can we figure that time to ourselves?  The Orientals try to get a hint of eternity by saying that when the Himalayas have been ground to powder by allowing a gauze veil to float against them once in a thousand years, eternity will only have just begun.  Our mountains have been pulverized by a process almost as slow.  In our case the gauze veil is the air, and the rains, and the snows, before which even granite crumbles.  See what the god of erosion, in the shape of water, has done in the river valleys and gorges—­cut a mile deep in the Colorado canyon, and yet this canyon is but of yesterday in geologic time.  Only give the evolutionary god time enough and all these miracles are surely wrought.

Truly it is hard for us to realize what a part time has played in the earth’s history,—­just time, duration,—­so slowly, oh, so slowly, have the great changes been brought about!  The turning of mud and silt into rock in the bottom of the old seas seems to have been merely a question of time.  Mud does not become rock in man’s time, nor vegetable matter become coal.  These processes are too slow for us.  The flexing and folding of the rocky strata, miles deep, under an even pressure, is only a question of time.  Allow