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[6] R. S. Phil. Trans ., 1868.
[7] Ast. Nach ., No. 1, 864.
BOOK IV. THE PHYSICAL PERIOD
We have seen how the theory of the so-
lar system was slowly developed by the con-
stant efforts of the human mind to find out
what are the rules of cause and effect by
which our conception of the present uni-
verse and its development seems to be bound.
432