The Abundance Of Life
WE had reached the Pass of Tre Croci and from a point a little below the summit, looked eastward over the glorious Val Buona. The pines which clothed the floor and lower slopes of the valley, extended their multitudes into the furthest distance, among the many recesses of the mountains, and into the confluent Val di Misurina. In the sunshine the Alpine butterflies flitted from stone to stone. The ground at our feet and everywhere throughout the forests teamed with the countless millions of the small black ants.
It was a magnificent display of vitality； of the aggressiveness of vitality, assailing the barren heights of the limestone, wringing a subsistence from dead things. And the question suggested itself with new force: why the abundance of life and its unending activity?
In trying to answer this question, the present sketch originated.
I propose to refer for an answer to dynamic considerations. It is apparent that natural selection can only be concer

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