Incluye referencias bibliográficas (páginas 207-212).

Prologue -- Definition of Substance -- The Creating Substance: The Author's Confession of Faith -- The Created Substance: The Five Classes of Rational Beings -- Demons or Angels -- The Elements -- Chaos and the Work of the Creator and Nature -- The Creation of the Four Elements from Chaos -- What Caused the Creation of Such Elements -- Why God Created Two Middle Elements -- The Syzygy, or the Interconnection of the Elements -- The Movement of the Elements -- There Are No Waters above the Heavens -- The Creation of the Stars -- The Creation of Animals and Man -- The Quintessence -- The Movement of the Stars and the Firmament -- The Heavenly Circles -- The Planets: Saturn -- Jupiter and Mars -- The Retrograde Motion and Standstill of the Planets -- Venus and Mercury -- The Movement of Venus and Mercury -- The Natural Movement of the Sun -- The Four Seasons: Winter -- Spring -- Summer -- Autumn -- The Accidental Motion of the Sun -- The Eclipse of the Sun -- The Moon -- The Eclipse of the Moon -- Winds -- Rain -- The Rainbow -- Hail and Snow -- Thunder, Coruscation, and Lightning -- Shooting Stars -- Comets -- Water and the Tides of the Ocean -- Why the Sea Is Salt -- The Origin of the Water in Wells -- Flood and Conflagration -- The Form of the Earth -- The Qualities of the Earth -- The Four Areas of Habitation of the Earth -- Our Habitable Area -- Things Supported by the Earth -- Sperm -- Intercourse -- Conception and the Formation of the Fetus -- Birth and Infancy -- Sensation -- The Working of the Natural Virtues in Humans -- Growth -- Sleep -- The Virtue of Breath -- The Virtue of the Soul -- The Head and the Hair -- The Meninges and the Brain -- The Eyes and the Sight -- Mirror Images and Other Amazing Phenomena Concerning Sight -- Ears and Hearing -- The Other Senses -- Voluntary Motion -- Imagination and the Other Functions of the Soul -- The Human Soul -- The Faculties of the Soul -- Teaching and Learning.