| FIG. | PAGE |
| 1.—Increase of population in the United States and the principal countries of Europe from 1800 to 1900 | [26] |
| 2.—Relative and absolute numbers of prisoners in the United States from 1850 to 1904 | [30] |
| 3.—Recorded measurements of the stature of 1052 mothers | [57] |
| 4.—Model to illustrate the law of probability or "chance" | [59] |
| 5.—Plinth to illustrate the difference between variability (fluctuation) and variation (mutation) | [64] |
| 6.—Curves illustrating the relation between the pure line and the species or other large group | [67] |
| 7.—Diagram showing the course of color heredity in the Andalusian fowl | [83] |
| 8.—Diagram showing the course of color heredity in the guinea-pig | [85] |
| 9.—Diagram illustrating the relation of the germ cells in a simple case of Mendelian heredity | [92] |
| 10.—Diagram illustrating the phenomenon of regression | [107] |
| 11.—Diagrams showing the relation between order of birth and incidence of pathological defect | [125] |
| 12.—Coefficients of heredity of physical and psychical characters in school children | [144] |
| 13.—Family history showing brachydactylism. Farabee's data | [151] |
| 14.—Family history showing polydactylism | [155] |
| 15.—Mother and daughters showing "split hand" Facing | [156] |
| 16.—Two family histories showing "split foot" Facing | [158] |
| 17.—Family history showing congenital cataract | [159] |
| 18.—Family history showing a form of night blindness | [161] |
| 19.—Family history showing a form of night blindness | [163] |
| 20.—Family history showing Huntington's chorea | [165] |
| 21.—Family history showing deaf-mutism | [167] |
| 22.—Family history showing feeble-mindedness | [169] |
| 23.—Family history showing angio-neurotic œdema | [170] |
| 24.—Family history showing tuberculosis | [171] |
| 25.—Family history showing infertility | [175] |
| 26.—Family history showing ability | [177] |
| 27.—Family history showing ability | [179] |
| 28.—History of three markedly able families | [183] |
| 29.—History of Die Familie Zero | [185] |