Man a tool-making animal, [247]
Mariner's compass, [405]
Matter distinguished from spirit, [1]
Matter, effects of, on senses, [6]
Matter, forms of, [7]
Matter, nature of, [14]
Matter, constitution of, [14]
Matter, variety in properties of, [17]
Matter, divisibility of, [18], [51]
Matter, minute division of, [19]