Every effort has been made to replicate this text as faithfully as possible, including obsolete and variant spellings. Obvious typographical errors in punctuation (misplaced quotes and the like) have been fixed. Corrections [in brackets] in the text are noted below: page 85 years in investigating. The man who sets out to make a research, without first acertaining[ascertaining] what others have done in that direction, proposes to page 121 (Footnote 32) Conklyn, _Heredity and Environment in the Development of Men_. Princetown[Princeton] University Press, 1915. page 136 mere personification and means either chance-medley or a Creator, according to the old dilemna.[dilemma] There is a very curious example of this inability page 153: We come to close quarters with the question itself in 1668, when Franceso[Francesco] Redi (1626-1697) published his book on the generation of insects