What we are to understand by a chance distribution is one in accordance with law, and one the nature of which can, for all practical purposes, be closely predicted." If the universe be pregnant with purpose, as we all wish to believe, why should not this purpose work itself out by an evolution process under law ?--and if under law, why not the law of Probabilities?
We who have our lives insured provide for our children through our knowledge and use of this law; and our plans for their welfare, in most of the affairs of life, are based upon the recognition of it.

Who will deny to the Great Purpose a similar resource in producing the universe and in providing for us all?
I add in a concluding section on Literature some references to various books in English, classified under the headings of the chapters of the text.

These works will further enlighten the reader, and, if he persevere, possibly make a psychologist of him.
J.MARK BALDWIN.
PRINCETON, _April, 1898_.
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