454 



INULX. 



Rhodites rosae, parthenogenesis of, 325. 



Richter, on inheritance of acquired 

 characters, 438. 



Bobin, on pole-cells of Diptera, 197. 



Rolph, on conjugation, 386. 



Romanes, on correlation, 389. 



Roth, on heredity, 166, 169. 



Rotifera, unequal length of life in two 

 sexes of, 58 ; polar bodies of, 350. 



Roule, on origin of ova, 232. 



Roux, on the struggle of the parts in the 

 organism, 87, 100 ; on development in 

 altered conditions, 177; on forces con- 

 trolling nuclear division, 231, 361; on 

 karyokinesis, 359. 



Rudimentary organs, 88 ; disappear- 

 ance of, 291 ; not found in partheno- 

 genetic forms, 293. 



Rumia Crataegata, 394. 



Sachs, on reproduction in Mosses, 212; 



on venation, 260, 310 ; on shoots of 



climbing Ivy, 393, 399. 

 Sagitta, segmentation of egg of, 74, 199. 

 Saperda carcharias, length of life of 



imago of, 47. 

 Sarcophaga carnaria, length of life of, 



42. 

 Saturnia pyri, length of life of, 45 ; S. 



carpini, cocoon of, 94. 

 Saturnidae, habits of, 44. 

 Saw-flies, ancestors of bees and wasps, 



19 ; length of life of imago of, 49, 59. 

 Schmidt, on malformations of the ear, 



440. 

 Schneider, on instincts of perception, 



92, 94. 

 Schultze, on polar bodies of Amphibia, 



34, 352. 

 Scytosiphon, male parthenogenesis in, 



247. 



Sea-gulls' eggs, 38. 

 Senility, 20, 21, 32. 157. 

 Sexes, unequal length of life in the two, 



58. 



Sheep, length of life of, 14. 

 Sida, spermatozoa of, 176 ; absorption of 



ova in, 239. 

 Siebold, von, on development of Bees, 



235- 

 Siphonophora, origin of germ-cells of, 



202. 



Sirenia, 261. 



Sirex, length of larval life of, 15. 

 Smerinthus tiliae, length of life of 



imago of, 45 ; ocellatus, 395. 

 Solenobia triquetrella, length of life 



of female of, 45 ; death of partheno- 



genetic forms of, 64, 293. 

 Solidago, time of flowering changed, 



4I5- 

 Soma, 122. 125, 130, 140, 144, 154. 155. 



Somatic cells, 27, 28, 75, ill, 145, 158. 



Somatogenic characters, 412. 



Somatoplasm, 104, 180. 



Spathegaster, 49. 



Spencer, Herbert, on relation of absorb- 

 ing surface to size of animal, 7 ; on in- 

 fluence of diminished nutrition, 241 ; 

 on correlation, 389. 



Spirogyra, on cell-division in, 216. 



Sponges, polar bodies of, 217. 



Spontaneous generation, 34. 



Sprengel, on colours in flowers, 308. 



Squirrel, length of life of, 14. 



Stahl, on protective structures in plants, 

 260. 



Strasburger, on fertilization of Phanero- 

 gams, 178, 340, 355 ; on cyto-idioplasm, 

 181 ; on influence of nuclei, 184; on 

 identity of daughter nuclei, 187 ; on 

 nuclei of sexual-cells, 200, 215, 246; 

 on transmission of germ-plasm, 209 ; 

 on cell-division in Spir.ogyra, 216; on 

 development of pollen-grains, 222 ; on 

 parthenogenesis, 237; on direction of 

 growth of pollen-tube, 247 ; on here- 

 dity? 354) 369, 369; on polar bodies in 

 plants, 377. 



Strepsiptera, length of life of, 41 ; un- 

 equal length of life in two sexes, 58, 



59- 



Succineae, length of life of, 55. 

 Swans, length of life of, 37. 



Tagetes, production of double flowers of, 



408. 

 Talents, transmission of, 95 ; nature of, 



96. 



Tape-worms, 133, 155. 

 Termites, duration of life of, 1 8, 40. 

 Terns' eggs, 38. 

 Thuja, dorso-ventral structure of shoots 



of. 39 T > 39 6 - 



Tillina magna, 118, 148. 



Toad, length of life of, 6. 



Transmission of acquired characters, 

 73, 80, 169, 267, 407, 411; want of 

 evidence of the, 81 ; unnecessary for 

 the theory of evolution, 83 ; unproved, 

 105, 142; amongst Protozoa, 278; 

 supposed botanical proofs of, 387. 



Trematodes, parasitic in Mollusca, 57, 



131, 133- 



Trichodinidae, conjugation of, 287. 

 Trichoplax adhaerens. 141. 

 Tridacna gigas, length of life of, 56. 

 Trinchese, on polar bodies, 189, 224. 

 Tropaeolum, two kinds of leaves of, 396. 

 Turkey, the length of life of, 36. 

 Twins, 380. 



Unicellular organisms, immortality of, 



& -7- 

 Unio, length <>f lite f, ?(>. 57. 



