Original (inglés)

LIST OF ILLUSTRATIONS Fig. 1. The human ovum Fig. 2. Stem-cell of an echinoderm Fig. 3. Three epithelial cells Fig. 4. Five spiny or grooved cells Fig. 5. Ten liver-cells Fig. 6. Nine star-shaped bone-cells Fig. 7. Eleven star-shaped cells Fig. 8. Unfertilised ovum of an echinoderm Fig. 9. A large branching nerve-cell Fig. 10. Blood-cells Fig. 11. Indirect or mitotic cell-division Fig. 12. Mobile cells Fig. 13. Ova of various animals Fig. 14. The human ovum Fig. 15. Fertilised ovu