Includes proofs for three unpublished articles (indicated by a 1962 note): "The Mysteries of the Body" on cells, organs, blood, the digestive system, the liver, the nervous system and the brain, the senses, reproduction, and genetics; "Are We Alone in Space?" on the necessary conditions for life to develop outside the Earth; "The River of Life" on the origin of life on Earth up till human life (with a supplement from the Illustrated London News showing human evolution).