- Scyromathia, 744
- Searle, H., 491
- Sea urchins, 661; egg of, 173; growth of, 117, 147
- Sebastes, 749
- Sectio aurea, 511, 643, 649
- Sedgwick, A., 197, 199
- Sûˋdillot, Charles E., 688
- Segmentation of egg, 57, 310, 344, 382, etc.; spiral do., 371, 453
- Segner, J. A. von, 205
- Selaginella, 404
- Semi-permeable membranes, 272
- Sepia, 575, 577
- Septa, 577, 592
- Serpula, 603
- Sexual characters, 135
- Sharpe, D., 728
- Shearing stress, 684, 730, etc.
- Sheep, 613, 730, 738
- Shell, formation of, 422
- Sigaretus, 554
- Silkworm, growth of, 83
- Similitude, principle of, 17
- Sims Woodhead, G., 414, 434
- Siphonogorgia, 413
- Skeleton, 19, 438, 675, 691, etc.
- Snow crystals, 250, 480, 611
- Soap-bubbles, 43, 219, 299, 307, etc.
- Socrates, 8
- Sohncke, L. A., 202
- Solanum, 625
- Solarium, 547, 554, 557, 559
- Solecurtus, 564
- Solen, 565
- Sollas, W. J., 440, 450, 455
- Solubility of salts, 434
- Sorby, H. C., 412, 414, 728
Table of Contents
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