Contents 



Part Two. 



Chapter Pcig^ 



XIII — Organic Evolution 153 



XIV — A Little Astronomy and Geology 164 



XV — The Beginning of Life 171 



XVI — The Preparation for Higher Life 182 



XVII — Complex Life — The Invertebrates 192 



XVIII— The Reptiles 199 



XIX— Cooperation of Plant Life 208 



XX— The Birds 216 



XXI— The Mammals '. 222 



XXII — The Evidence Furnished by Embryology 234 



XXIII — The Evidence Furnished by Anthropology 242 



XXIV — Casting Off the Useless Organs 256 



XXV — The Life Spark and The Soul Spark 268 



XXVI— What the Future May Develop 278 



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