"[Vol. 1] gives in part I. a shortened, revised ... account of what was published in my Analytische Theorie der organischen Entwicklung (1894), Die localisation morphogenetischer Vorgänge; ein Beweis vitalistischen Geschehens (1899), and Die organischen Regulationen (1901 ... Part II has never been published in any systematic form before"--Pref., v. 1
"The third part of the scientific section, with which this volume opens is ... an enlarged and improved second edition of my work, Die "Seele" als elementarer Naturfaktor (1903) ... Of the philosophical section only part I. B 1 and 2 (p. 162-188) contains matter that I have already published elsewhere--in part I. of my Naturbegriffe und Natururteile (1904)"--Pref., v. 2.