"This psychological phenomenon was brought about mainly by the efforts of two men... Thomas Henry Huxley and Ernst Heinrich Haeckel. Both were fervent Darwinists... These two men were exceedingly able; but they spoke with the voice of authority on subjects which they themselves, in many particulars, were merely guessing at. These conclusions are not mine alone. They are also the conclusions of many scientific researchers and thinkers of today. (Ch 3)"