- Spallanzani, L., 138
- Span of arms, 63, 93
- Spangenberg, Fr., 342
- Specific characters, 246, 380; inductive capacity, 177; surface, 32, 215
- Spencer, Herbert, 18, 22
- Spermatozoon, path of, 193
- Sperm-cells of Crustacea, 273
- Sphacelaria, 351
- Sphaerechinus, 117, 147
- Sphagnum, 402, 407
- Sphere, 218, 225
- Spherocrystals, 434
- Spherulites, 422
- Spicules, 282, 411, etc.
- Spiderãs web, 231
- Spindle, nuclear, 169, 174
- Spinning of protoplasm, 164
- Spiral, geodetic, 488; logarithmic, 493, etc.; segmentation, 371, 453
- Spireme, 173, 180
- Spirifer, 561, 568
- Spirillum, 46, 253
- Spirochaetes, 46, 230, 266
- Spirographis, 586
- Spirogyra, 12, 221, 227, 242, 244, 275, 287, 289
- Spirorbis, 586, 603
- Spirula, 528, 547, 554, 575, 577
- Spitzka, E. A., 92
- Splashes, 235, 236, 254, 260
- Sponge-spicules, 436, 440
- Spontaneous generation, 420
- Sporangium, 406
- Spottiswoode, W., 779
- Spray, 236
- Stallo, J. B., 1
- Standard deviation, 78
- Starch, 432
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