- Ibex, 617
- Ice, structure of, 428
- Ichthyosaurus, 755
- Icosahedron, 478
- Iguanodon, 706, 708
- Inachus, sperm-cells of, 273
- Infusoria, 246, 489
- Intussusception, 202
- Inulin, 432
- Invagination, 56, 344
- Iodine, 136
- Irvine, Robert, 414, 434
- Isocardia, 561, 577
- Isoperimetrical problems, 208, 346
- Isotonic solutions, 130, 274
- Iterson, G. van, 595
Table of Contents
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