1XDEX. 



Monocotyledons, 56, 57 

 Morphology, 19 

 Morren, 318 



Morula, 173, 184, 185, 186 

 Mosses, 56, 58 

 Mouth of insects, 263 

 Mulberry stage (see Morula) 

 Mulder, 63, 64 

 Miiller, F., 204, 318 

 Myosotis, 329 

 Myrmecobius, 29 

 Mysis, 213, 214 

 Myxodictyum, 277 



N 



Nageli, 332 



Nais, 285, 297 



Natural history, 14, 16 



Natural selection, 5, 7, 8, 112, 146 



Nauplius, 203, 206 et sey., 211, 268, 



351 



Nautilus, 347 

 Nereis, 231 

 Nerve-cells, 72 

 Nettles, 311 

 Neuroptera, 261 

 Newts, 235 et seq. , 246 

 Notochord, 53, 104, 177, 178, 181, 



356 



Nototrema, 238 

 "Nurses," 261 

 Nutrition, 22 



Oak, 311 

 Odontopteryx, 161 



Ogle, 335 



Oken, 125 



Olynthus, 172 



Ontogenesis, 193 



Oolite, 29 



Operculum, 232 



Ophiocephali, 119 



Opisthodelphys, 238 



Opossums, 30 



Orchids, fertilization of, 336 



Origin of species (see Species ; Natural 



selection, &c.) 

 Ornithorhynchus, 165 

 Orohippus, 95 

 Orthoptera, 259 

 Otter sheep, 148 



Ovary (see Pistil) 

 Ovules, 308, 309 

 Ovum (see Egg) 

 Owen, 125, 126, 161 

 Oyster, 223 



Packard, 266 



Paget, 364 



Palaeotherium, 153 



Palceozoic rocks, 106 



Pallas, 99 



Palm, fertilization of, 326 



Pander, 170, 183 



Parasitism, 50, 350 



Parker, W. K., 126, 127 



Passion flower, 137 



Personality of animals, 289, 292 



Petals (see Corolla) 



Petiole, 137 



Petunia, 133 



Penoeus, 213 et seq. 



Pentacrinus, 199 



Pea, 137, 318, 333 



Pear, 141 



Peripatus, 268 



Permanent larval forms, 176 



Phanerogams, 56, 57 



Phohippus, 95 



Phylogenesis, 193 



Physiological division of labour, 49 



Physiology, 21 



Pigeons, 147 



Pipa, 239 



Pistil, 82, 131, 312 et seq. ' 



Placenta, 315 



Plantago, 328 



Plant-lice (see Aphides) 



Plants, industry of, 301 



Planula, 173 



Plesiosaurus, 346 



Pluteus, 197 



Pollen (see Stamen) 



Pollinia, 316 



Polyenma, 267 



Polypterus, 103, 116 



Polyzoa, 230 



Pond snail, 226 



Prickles, 138 



Primitive groove, 180 



Primrose, 310, 315, 320 



Proteus, 119, 236 



Prothallus, 58 



