INDEX OF SUBJECTS 



333 



isolated, 215, 221 ; of Ctenophora, 



39, 209-211. 

 Micropyle, 183. 



Migration of cells, 4, 5 ; of spicule 

 cells in Echinoids, 114. 



Mind and matter, 301. 



Minimum temperature, see Tempera- 

 ture. 



Mitosis, quadripolar,tripolar, 263-265. 



Mitotic index, 65. 



Mitrocoma, isolated blastomeres, 181 ; 

 fusion of blastulae, 202. 



Moina, 24. 



Molecules, meridional rows of, in 

 Frog's egg, 83. 



Mollusca, muscles of, 5 ; segmenta- 

 tions of, 25 ; eggs of, influence of 

 gravity on, 78 ; isolated blasto- 

 meres, egg-fragments, 215 sqq. ; 

 symmetry of egg and embryo, 244. 



Monaster, 267. 



Monsters, double, in lithium salts, 

 138 ; of Frog, 171, 172 ; of Newt, 

 174, 175 ; of Amphioxus, 181 ; of 

 Asteriasand Echinus, 194; of Sphaer- 

 echinus, 201. 



Monstrosity, 1; natural, 18, 159; 

 significance of, 155, 156 ; produced 

 by shocks, 89 ; perpetual rotation, 



90 ; by sound vibrations, 90 ; by 

 electric currents and magnetism, 



91 ; by heat and cold, 98 sqq. ; by 

 chemical agents, 120-121, 132; 

 significance for variation, 141. 



Moral consciousness, 289, 299, 300. 



Morphaesthetic, 291. 



Morphine, effect on fertilization, 128- 

 130 ; on Hen's egg, 132. 



Morphography, 12. 



Morphology, method of, 12 ; experi- 

 mental, 1. 



Mosaik-Theorie, see Theory, mosaic ; 

 segmentation, see Segmentation. 



Motion imparted by male element, 

 295, 296. 



Mouth, growth of, 70. 



Movements, of cells and cell-aggre- 

 gates, 4 sqq., 272 ; in segmentation, 

 see Cell ; of organ-forming substances, 

 207, 208, 226, 227; protoplasmic, 



40, 41. 

 Mucin, 58, 79. 



Muscles, in Arthropods, 5 ; of Ascidia, 

 235, 237 ; in MoUusca, 5 ; of gut, 

 5 ; of blood-vessels, 273 ; striated, 

 55 ; abnormal, in rotated Hen's 

 eggs, 90; contractions of, see Con- 

 traction. 



Mutations, 141. 



Myotomes, 11. 



Myriapods, 24. 

 Mysis, 24. 

 Mysostoma, 214, 228. 



Nature, 301. 



Neck, rate of growth, 70. 



Necturus, 168. 



Nematocysts in Planula, 3. 



Nemertines, segmentation in, 25 ; 

 isolated blastomeres and egg-frag- 

 ments, 204-208. 



Neo-vitalism, 20 ; see a/so Vitalism. 



Nephelis, 40. 



Nephridia of Earthworm, 3, 5 ; of 

 Annelids, fusion with coelom, 6. 



Ntreis, segmentation in, 25, 47; un- 

 equal asters, 30 ; egg compressed, 

 39, 213 ; crossed polar furrows, 46 ; 

 change of shape of cells, 48 ; arti- 

 ficial parthenogenesis, 124. 



Nerves, growth of, 5 ; branching of, 6; 

 anastomoses of roots, 6 ; plexuses 

 of, 6 ; fusion with end-organ, 6 ; 

 crest, 11 ; ganglia, fusion of, 11 ; 

 fibres, 273 ; physiology of, 290. 



Nervous system of Earthworm, 3 ; 

 ofTeleostei, 6, 11, 133; of Inverte- 

 brates, 11 ; of Ascidia, 235, 237. 



Neural, see Nerve. 



Newt, development of half-blasto- 

 meres, 173 ; double monsters, 174, 

 175. 



Nickel nitrate, 94. 



Nicotine', andeggsof.Bw/o, 120 ; effect 

 on fertilization, 126, 130 ; on Hen's 

 egg, 132. 



Nitrates, 123. 



Nitric oxide, eggs of Ascaris in, 112. 



Nitrogen, eggs in, 110, 112. 



Non-electrolytes, poisonous effects of, 

 136 ; see also Cane-sugar, Dextrose, 

 Urea. 



Normal temperature, see Temperature. 



Notochord, vacuoles of, 2 ; early 

 differentiation of, 3; application 

 of skeletal cells to, 5, 11 ; formation 

 of in Urodela, &c., 8 ; from archen- 

 teron, 11 ; divided at high tem- 

 peratures, 99 ; in cane-sugar, 133 ; 

 whole, in Hemi-embryo, 160 ; of 

 Ascidia, 235, 237. 



Notochordal tissue, in neural tube 

 and archenteron, 134. 



Nucleus, division of, a factor in de- 

 velopment, 2, 22 sqq. ; division of, 

 direction determines that of cell, 

 31, 55 ; rules of Hertwig for, 31, 

 32 ; rule of Pfluger for, 32 ; polar 

 divisions of Insects, 29 ; polar divi- 

 sions with equal asters, 31 ; division 



