INDEX 



375 



streaming movements of, 53, 54 ; 

 influence of gravity, 54 ; of light, 

 ih. ; movements in drops of, under 

 action of electric current, 58 ; 

 nodal points of, 27-30 ; opacity 

 of, 21 ; pellicle-like layer round, 

 36 ; position of granules "in, 244- 

 246 ; preparation of, 8, 18, 19 ; 

 produced by the electric current, 

 56 ; produced by potassium car- 

 . bonate solution, 21 ; produced 

 again in reduced drops, 31 ; 

 radiate appearances in drops of, 

 41-44 ; drops of, reaction to 

 electricity, 54-61 ; reduction of, 

 by evaporation, 30 ; resemblance 

 to protoplasm, 85 ; streaming 

 movements of, 47-52 ; streaming 

 movements of drops of, in cells, 

 80, 81 ; explanation of streaming 

 movements in drops of, 74-80 ; 

 structure of, 22-38 ; made from 

 viscid oil, nature of, 44 ; fibrous 

 structures in, 44-46 



Oil membrane of protoplasm, 309, 

 318, 319 ; Quincke's vievirs on, 

 306, 307 



Oils suitable for oil-foams, experiments 

 on, 18 



Olive oil, for producing foams, 8, 11 ; 

 method of preparing, for produc- 

 ing oil-foams, 16, 17 



Ophidomonas jenensis, structure of, 

 118 



Optical apparatus used for investigat- 

 ing protoplasm, 86 

 appearance of a network between 

 suspended granules, etc., and 

 in foams and protoplasm, 209- 

 216 ; ia Plasmodia of JSthalium, 

 113 

 properties of microscopic foam, 23 



Organisation of protoplasm (Briicke), 

 220, 221 



OsoiUarioe, structure of, 118, 120, 

 121 



Osmosis producing radiate appearances 

 in protoplasm, 252, 253 



Ova, radiate appearances in, 251-253 ; 

 structure of, 124-127 ; Schneider's 

 observations on, 182 



Pabaefin oil, for producing oil-foams, 

 11 ; extension-currents in drops 

 of, 63, 64 



Parartmcivm, trichocyst layer, 241 ; 

 cavdaiums,-aA.putrinum,, structure 

 of endoplasm, 89 ; macro-nucleus, 

 90, 91 ; bwsaria, reticular struc- 

 ture of protoplasm, 89 



Pellicle in drops of oil-foam, 32, 36 ; 

 on surface of protoplasm, 236 ; 

 in Acineta, 87 ; in Amc^ice, 107, 

 312; in Flagellata (Ohilomonas), 

 91 ; in red blood corpuscles of 

 frog, 128 ; in pseudopodia of 

 Gromia, 104 ; in ova of Hyda- 

 Una, 125 ,: in liver cells (frog), 

 141 ; in protoplasm of MUiolidce, 

 etc., 95 ; round vacuoles, 233 ; 

 in Vorticdla, 88 



Pelomyxa, currents in water surround- 

 ing, 317-319 ; movement of, 308 

 footnote; non-adherent, 295 foot- 

 note; protoplasm of, 116, 117 ; 

 mndis, structure, of (Bourne), 311 

 footnote 



Peripatus, structure of egg, 176 



Periplaneta orientalis, Bacteroids in 

 fat body, 201 ; salivary glands of, 

 105 



Peritoneal cells of BranchiobdeUa, 136, 

 137 



Pfeffer, artificial production of vacuoles, 

 232 ; on the nature of protoplasm 

 in Plasmodia, 226 footnote; on 

 the "protoplasmic membrane," 

 ^ZS footnote, 235 



Pfitzner, alveolar layer observed by, 

 239 ; on blood corpuscles of frog, 

 130 ; on reticular structures in 

 protoplasm, 173 ; on protoplasmic 

 structures, 193, 194 



Pfltiger, criticism of Leydig on nerve 

 structure, 281, 282 ; on the 

 nature of protoplasm, 224 ; ob- 

 servations on epithelial cells, 

 axis-cylinders, and liver cells, 

 161 ; views on protoplasmic 

 structure, 181 



Phanerogams, radiate appearances in 

 embryo sac of, 253 



Phascolosoma elongatwm, cuticle of, 

 138, 241 



Pigment cells of Aidastomwm, 143 



Pilidium, epidermic cells of, 162 



Plant cells, movements of granules in, 

 320; protoplasm of, 122-124; 

 rotational currents in, 327-330 ; 

 streamings in : Berthold's views, 

 290 - 305 ; Engelmann's views, 

 277, 278 ; Nageli and Schwen- 

 dener, 291 ; Quincke, 305-307 ; 

 Schmitz's observations on, 169 ; 

 Strassburger's observations on, 

 167 ; Velten, 291 ; Wakker, ib. ; 

 structure of, Fayod's observations 

 on, 184 ; Quincke, 306 ; Velten's 

 observations on, 165 



Plasmodia ofjEthalium septicum, 111 



