INDEX 



791 



Selaginella 404 

 Scmi-pcrmeable 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, 4.50, 455 



Solubihty of salts 434 



Sorby, H. C. 412, 414, 728 



Spallanzani, L. 138 



Span of arms 63, 93 



Spangenberg, Fr. 342 



Specific characters 246, 380; induc- 

 tive 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. 



Spider's 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 



Spiroehaetes 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 



iSporangium 406 



Spottiswoode, W. 779 



Spray 236 



Stallo, J. B. 1 



Standard deviation 78 



Starch 432 



Starling, E. H. 135 



Stassfurt salt 433 



Stegocephalus 746 



Stegosaurus 706, 707, 710, 754 



Steiner, Jacob 654 



Steinmann, G. 431 



Stellate cells 335 



Stentor 147 



Stereometry 417 



Sternoptyx 748 



Stillmann, .1. D. B. 695 



St Loup, R. 82 



Stokes, Sir G. G. 44 



Stole, Ant. 452 



Stomach, muscles of 490 



Stomata 393 



Stomatella 554 



Strasbiirger, E. 35, 283, 409 



Straus-Diirckheim. H. E. 30 



Stream-lines 250, 673, 736 



Strength of materials 676, 679 



Streptoplasma 391 



Strophomena 567 



Studer, T. 413 



Stylonichia 133 



Succinea 556 



Sunflower 494, 635, 639, 688 



Surface energy 32, 34, 191, 207, 278, 



293, 460, 599 

 Survival of species 251 

 Sutures of cephalopods 583 

 Swammerdam, J. 8, 87, 380, 528, 585 

 Swezy, Olive 268 

 Sylvester, J. J. 723 

 Symmetry, meaning of 209 

 Synapta, egg of 453 

 Syncytium 200 

 Synhelia 327 

 Szielasko, A. 654 



Tadpole, growth of 83, 114, 138, 153 



Tait, P. G. 35, 43, 207, 644 



Taonia 355, 356 



Tapetum 407 



Tapir 741, 763 



Taylor, W. W. 277, 282, 426, 428 



Teeth 424, 612, 632 



Telescopium 557 



Telesius, Bernardinus 656 



Telhna 562 



Temperature coefficient 109 



Terebra 529, 557, 559 



Terebratula 568, 574, 576 



