Pp. x, 435, 56 text-figures. Publisher's printed, pictorial white wrappers lettered in black on spine and front cover, lg 8vo. This book examines the evolutionary mechanisms in higher plants. This volume is from the research collection of herpetologist Lauren E. Brown with his signature on the half title. Neat underlining on pages 6, 47, 58, 59, 111, 186, 188, 193, 295-297.