374 



PROTOPLASM 



23, 25 ; arrangement of, causing 

 fibrous appearances in oil-foams, 

 45 



Method of preparing oil - foams, 8, 

 16-18 



Methods of producing extension -cur- 

 rents, 68-73 ; of fixing and staining 

 with iodine - alcohol, 90, 91 ; of 

 staining and investigating proto- 

 plasm, lli footnote. ; of fixing the 

 pseudopodia of Miliolidoe, etc., 

 WQ footnote; of fixing plasmodia, 

 112 ; optical, of investigating 

 protoplasm, 86 



Micrococci, their resemblance to proto- 

 plasmic granules, 193 



Microscopic foam, appearance of, 23 ; 

 false network in, 213-216 ; granu- 

 lar appearance in, 27, 30 ; nodal 

 points of, 26 - 30 ; properties of, 

 23-25 ; theoretical explanation of 

 their fluid nature, 34 and footnote 

 investigation of protoplasm, 86 



Microsomes of Hansteiu, 192, 223 



MUiolidoe, protoplasm of, 95, 96 ; 

 pseudopodia of, 97-101 



Molecules of protoplasm and imbibi- 

 tion, 271-278 



Montgomery, hypothesis of protoplasmic 

 movement, 287, 288 



Movements caused by surface tension 

 in oil -drops, 62-67; of foam- 

 drops, 47 - 54 ; continuance of, 

 52, 53 ; under action of electric 

 current, 58 ; influence of tempera- 

 ture upon, 53, 54 ; influence of 

 gravity, 54 ; of light, ih. ; inde- 

 pendent, of granules, 319 - 323 ; 

 of protoplasm, see Protoplasmic 

 Movement 



Muscle fibril, structure of, 325-327 ; 

 thread in stalk of Zoothamrdvm, 

 90 



Muscular contraction, explanation of, 

 325-327 



Myxomycetes, protoplasm of, Pfeffer's 

 views, 226 footnote; see also 

 ^thalium 



Nagbli, on independent movement of 

 granules, 321 ; and Schwendener 

 on contractility, 271 ; on dif- 

 fraction areffi, 210 ; optical ap- 

 pearances in air-bubbles, 29 ; on 

 streaming in plant cells, 291 ; 

 on the viscid nature of proto- 

 plasm, 222 



Nansen's views upon nerve structure, 

 146-148, 154, 155 



Nassula, two radiate layers in, 241 



Negative streamings in foam - drops 

 caused by electrolysis, 54-57 



Nematode eggs, cell plate in, 239 

 {see also Ascaris) 



" Nematodes " of Altmann, 196 



Nerves, Eemak's observations on, 158 ; 

 structure of, 148-156 ; in Annelids 

 '(Eohde), 285-287 



Network, appearance of, in microscopic 

 foam, 23, 25 ; elongation of 

 meshes of, causing fibrous ap- 

 pearances in oil -foams, 45 ; (op- 

 tical) seen between suspended 

 granules or droplets and in foams 

 and protoplasm, 209-216 ; false, 

 in Plasmodia of ^tlialium, 113 



Noctiluca, structure of, 174 



Nodal points of oil-foams, 26-30 



Nodes of Ranvier, 150 



Non-polarisable brush electrodes, use 

 of, 55 



Nuclear division of Euglypha, 253 

 spindles, 246 - 251 ; in ovum of 

 Sphcerechinus, 126, 127 



Nucleus, Altmann's views upon, 200 ; 

 of Bacteria and CyanopJiyceas, 117- 

 122 ; of blood corpuscles of frog, 

 129 ; radiate layer of alveoli 

 round, 243, 244 ; Frommann's 

 views upon, 170 ; Heitzmann's 

 views upon, 163 



Nuclei of capillaries, 143, 144 ; of 

 connective tissue cells, 145 ; of 

 epithelial cells oi Lwrnhricus, 135 ; 

 giving rise to radiate appearances 

 in the protoplasm, 253 ; of sheath 

 of Schwann, 152 



Oil, diffusion of, through watery 

 lamellae, experiments to prove, 

 41 



Oil-drops, minute, apparent network 

 between, 212, 213 ; extension- 

 currents and movements in, 61- 

 74 ; rotational currents in, 74 



Oil-foams, alterations in volume of, 

 under the influence of the sur- 

 rounding fluid, 38-41 ; alveolar 

 layer of, 32-36 ; apparent homo- 

 geneous border in, 37 ; appear- 

 ance of, 20 ; arrangement of 

 alveoli in, 31 ; durability of, 

 46, 47 ; fibrous structures in drops 

 of, 44-46 ; fluid nature of, 31, 

 32 ; fluid nature of alveolar layer, 

 35, 36 ; Frommann's experiments 

 upon, 82-84 ; granular appear- 

 ances in, 27-30 ; influence of in- 

 duction shocks upon, 60, 61 ; 

 influence of temperature upon 



