- Tissues, forms of, 293
- Titanotherium, 704, 762
- Tomistoma, 753
- Tomlinson, C., 259, 428
- Tornier, G., 707
- Torsion, 621, 624
- Trachelophyllum, 249
- Transformations, theory of, 562, 719
- Traube, M., 287
- Trees, growth of, 119; height of, 19
- Trembley, Abraham, 138, 146
- Treutlein, P., 510
- Trianea, hairs of, 234
- Triangle, properties of, 508; of forces, 295
- Triasters, 327
- Trichodina, 252
- Trichomastix, 267
- Triepel, H., 683, 684
- Triloculina, 595
- Triton, 554
- Trochus, 377, 557, 560; embryology of, 340
- TrûÑndle, A., 625
- Trophon, 526
- Trout, growth of, 94
- Trypanosomes, 245, 266, 269
- Tubularia, 125, 126, 146
- Turbinate shells, 534
- Turbo, 518, 555
- Turgor, 125
- Turner, Sir W., 769
- Turritella, 489, 524, 527, 555, 557, 559
- Tusks, 515, 612
- Tutton, A. E. H., 202
- Twining plants, 624
- Tyndall, John, 428
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