It is almost as much on account of the super-history furnished by these essays as on account of what is said in them that I am now publishing them. They were not written with any definite purpose Of publication. The ones on spontaneous generation and multiple causes were prepared as addresses for scientific societies. That on the infinity Of nature was written mainly to enable me to see where my biological development was tending as touching other domains Of knowledge. TO state more specifically why I now publish the essays essentially as they were written, I find on approaching the completion Of the Unity of the Orgamm, that I need the essays in print, partly as record and partly as super-record. What I am writing now in the larger work, I want to attach directly to what I wrote earlier about the origin of life and to do so without rewrit ing the Old essay and incorporating it as a section in the later book.

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