A course of elementary instruction in practical biology / T.H. Huxley ; assisted by H.N. Martin. Huxley, Thomas Henry, 1825-1895. Martin, H. Newell (Henry Newell), 1848-1896. Biology. QH308 .H87 1879 574 HUC Includes index. On spine: Practical biology. On cover: Macmillan's manuals for students. London : Macmillan and Co., 1879. 1879. 1879 Text xi, 279 p. ; eng