INDEX 



Muller, 6, 206 



Mummy-wheat, 36 



Musk-glands, 288 



' Mutant,' 323 



Mutation, Theory of, 206 



Mysidse, 135 



Myxine glutitiosa, 286 



Nauplius, 133 



Nebular Theory, 85 



Neoccratodus, 18 



Neoscopelus macrolepidotus, 35 



Neptune, discovery of planet, 135 



Newt, 41 



Newton's law of gravitation, 7 



Nototrema, 279 



Nucleus, 74, 223; nuclear loops, 296 



nucleolus, 79; nucleus- corpuscle, 75 



nucleus-division, 81 

 'Nun moth,' 155 

 Nuptial dress, 180 

 Nurse-generation, 269 

 Nut tall, 137 



Octopus, 182 



Oedendorf, 108 



(Enothera, 206-207 



Ontogeny, 115 



Oocyte, 239 



Oogony, 237 



Ophichthys colubrinus, 16G 



Ophiuroidea, 129, 276 



Opuntia, 193 



Orchids, 194 



Organella, 77 



Oi-nitliorhynchus paradox us, 117, 281 



Os centrale, 126 



Oscillatoria, 188 



Ostrich, 22 



Over-fertilization, 296 



Oyster, 201 



PJEDOGENESIS, 271 

 Pagurus calidus, 181 

 Palceotlierium, 113 

 Palpal organs, 290 

 Paliidina, 112 

 Pandorina morum, 244 

 Paradoxides, 104 

 Param&cium, 221 



Parnassius apollo, 192 



Parrot, 199 



Parthenogenesis, 264, 299 



Pasteur, 30 



Pauly, 175, 185 



Pavy, 47 



Pelagia notiluca, 261 



Pelomyx, 69 



Penaus, 134 



Penguin, 22 



Pentacrinus, 128, 176, 



Peridinium, 243 



Periophtlialmus, 17 



Peripatus, 111 



Peristome-field, 222 



Peruvian system, 108 



Peysonnel, 62 



Pfliiger, 101 



Phagocyte, 73 



Phasmidse, 165 



Phosphorescence, 163 



Phyllium siccifolium, 165 



Phyllopteryx eques, 165 



Phylloxera vastatrix, 269 



Physeter macrocephalus, 109 



Physiologus, 7 



Pictet, 42 



Pieridse, 166 



Pigeons, races of, 143 



Pigment cells, 169 



Pike, 185 



Pill-beetle, sacred, 273 



Pinnipedia, 24 



Pipa americana, 279 



Placenta, 237 



Planorbis multiformis, 112 



Planula, 260 



Plant-lice, 269 



Plasmodium, 235 



Platurus, 166, 168 



Platyrhini, 138 



Plesiosaurm, 109 



Pliny, 6 



Pliocene strata, 113 



Plumularidae, 262 



Pluteus, 129, 197, 298 



Poison gland, 289 



Polar bear, 160 ; fox, 160 



Polygonum amphibium, 19G 



Polymorphism, 267 



