Foreword / H.F. Osborn -- Introduction / Sir C.S. Sherrington -- Evolution: its meaning / D.S. Jordan -- Why we must be evolutionists / J.A. Thomson -- Can we see evolution occurring / by H.S. Jennings -- Vestigial organs / G.H. Parker -- Evolution as shown by the development of the individual organism / E.W. MacBride -- Embryology and evolution / E.G. Conklin -- The geographical distribution of animals / W.B. Scott -- The record of the rocks / F.A. Bather -- The nature of species / J.W. Gregory -- The progression of life on earth / Sir A.S. Woodward -- The evolution of plants / C.S. Gager -- The story told by fossil plants / E.W. Berry -- Butterflies and moths as evidence of evolution / E.B. Poulton -- Evolution of the bee and the beehive / Sir A.E. Shipley -- The evolution of ants / W.M. Wheeler -- The evolution of the horse and the elephant / F.B. Loomis -- Evolution of the bird / D.M.S. Watson -- Connecting and missing links in the ascent to man / R.S. Lull -- The lineage of man / W.K. Gregory -- The human side of apes / S.J. Holmes -- The evolution of the brain / G.E. Smith -- Progress shown in evolution / J.S. Huxley -- Mind in evolution / C.L. Morgan -- Cumulative evidence for evolution / H.H. Newman.