Written by Herbert Spencer
The Principles of Biology, Volume 2 (of 2)
by Herbert SpencerTurning from the additions to the revisions, I have to say that the aid needed for bringing up to date the contents of this volume, has been given me by the gentlemen who gave me like aid in revising the first volume: omitting Prof. Perkin, within whose province none of the contents of this volume fall. Plant-Morphology and Plant-Physiology have be..