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12. Portrait of a young male gorilla 78 13. Portrait of a young male child 79 14. An infant, three weeks old, supporting its own weight 81 15. Sacrum of Gorilla compared with that of Man, showing the rudimentary tail-bones of each 82 16. Diagrammatic outline of the human embryo when about seven weeks old 83 17. Front and back view of adult human sacrum 84 18. Appendix vermiformis in Orang and in Man 85 19. The same, showing variation in the Orang 85 20. Human ear 86 21. Fœtus of an Orang 87 22. Vestigial characters of human ears 88 23. Hair-tracts on the arms and hands of Man, as compared with those on the arms and hands of Chimpanzee 90 24. Molar teeth of lower jaw in Gorilla, Orang, and Man 93 25. Perforation of the humerus (supra-condyloid foramen) in three species of Quadrumana where it normally occurs, and in Man, where it does not normally occur 95 26. Antlers of stag, showing successive addition of branches in successive years 100 27. Fission of a Protozoön 107 28. Hydra viridis, partly in section 111 29. Successive stages in the division of the ovum, or egg-cell, of a worm 113 30. Ovarian ovum of a Mammal 121 31. Amœboid movements of young egg-cells 122 32. Human ovum, mature and greatly magnified 123 33. Stages in the formation of the polar bodies in the ovum of a star-fish 125 34. Fertilization of the ovum of an echinoderm 126 35. Fertilization of the ovum of a star-fish 127 36. Karyokinesis of a typical tissue-cell (epithelium of Salamander) 129 37. Study of successive changes taking place in the nucleus of an epithelium-cell, preparatory to division of the cell 131 38. Formation and conjugation of the pronuclei in Ascaris megalocephala 132,
133 39. Segmentation of ovum 135 40. The contents of an ovum in an advanced stage of segmentation, drawn in perspective 135 41. Formation of the gastrula of