Rather than seeking support from the massive scholarly work on the 13th century thinker, Bobik (philosophy, U. of Notre Dame) translates and interprets Aquinas' work on the principles of nature and on the mixture of elements, and uses them as a basis for independent philosophy on the relationship between form and matter in the context of God's creative causality. Paragraphs of the Latin originals are followed by English versions, then Bobik's commentary. Annotation c. by Book News, Inc., Portland, Or.