This volume is made up from a course of lectures delivered under the auspices of the Lowell Institute in the autumn of 1895. These have been revised and to some extent rewritten, and the division into chapters made; but there has been no essential change. As all life proceeds from the egg, so all discussion must proceed from a definition. Indeed, it is generally necessary to follow definition by definition, fixing the meaning of the terms used in the original explanation, and again explaining the words employed in this exposition.…
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