45 2 



INDEX GLOSSARY. 



Node the point on a stem at which 



the leaves are borne. 

 Non-ruminants, 666 

 Notochord, 93, 206^210,422,42^, 716 



of dolichoglossus, 618 



of tunicates, 619 

 Nuclear membrane, 674, 685 



sap, 676 



spindle, 683 

 Nucleolus, 674 

 Nucleoli, 688 

 Nucleoplasm, 679 

 Nucleus, 1 6, 673 



function of, 680-682 



resting, 691 



structure of, 674 

 Nut, 158 



Oak galls, 238 



Oceanic islands, fauna of, 827 

 insects of, 836 



Ocelli, 580 



Octopus, 611, 616. (See also devil- 

 fish.) 



Odonata, 584, 585 



(Edogonium, 739 

 growth of, 728 



(Esophagus of crayfish, 458 



Oil, 350, 351, 672 



Oils, vegetable, 94 



Olfactory sense. (See sense of smell.) 



Oligochaeta, 545 



Oligotricha, 515 



Ommatidium, 79, 378, 384 



Omnivorous using all kinds of foods. 



Ontogeny, the history of the develop- 

 ment of the individual. 



Ontogenetic series, 809 



Oogonium (in the lower cryptogams) 

 a cell within which one or 

 more ova are formed. 



Oomycetes, 250 



Operculum, 279, 632, 633 



Ophidia, 645 



Ophioglossaceae, 283 



Ophiuroidea, 554 



Opilionidea, 570 



Opisthobranchia, 600, 602 



Opossum, 652, 654 



Optic nerve, 380 



Opuntia, 24 



Orang-utan, 668 



Orchids, 848 



Organ of Bojanus, 607 

 of Corti, 85, 86, 398 



Organism, 4 



Organization of the body, 331 

 Organs of response, 406- 



of sight, 374- 



of special sense, 366- 

 Origin of species, 789 

 Ornithorhynchus. (See duck-bill.) 

 Orthoptera, 582 

 Oscines, 650 

 Osmose, diffusion of a solution through 



a membrane, 69, 71 

 Osphradium, an olfactory organ found 



in many molluscs, 597 

 Ossification of vertebra, 217 

 Ostium, an opening, mouth, 471, 579 

 Ostracoda, 559 

 Ostrich, 650 

 Otters, 664 

 Ovary, 29, 125 



of hydra, 121, 500 

 Ovules, 29, 126 

 Ovum of hydra, 122, 500 



of nereis, 125 

 Owls, 650 

 Oxidation, 475 

 Oxygen, 67 



given off by plant, 87 

 Oxygenation of blood, 482 



Palps, a jointed sensory organ attached 



to the mouth appendages of 



arthropods, 580 

 Pain, 364 

 Palisade cells, 81 

 Palaeostraca, 564 

 Palisade tissue, 205 

 Paludina, development of, 805 

 Pancreas, 462, 720 

 Panther, 663 

 Papilio merope, 267 

 Papilionaceous blossom, 846 

 Paramoecium, TsS- 



conjugation in, 186, 699 

 Parasites, 215 

 Parasitism, 747 

 Parrots, 650 

 Parthenogenesis, development of an 



egg without fertilization, 581 

 Parenchyma, 72 

 Passeres, 650 

 Pasteur (Louis), 1822-95, French 



bacteriologist, 670 

 Pearly nautilus, 611, 616 

 Pecora, 666 

 Pedicl, 116 

 Pedipalpi, 568 



Numbers refer to paragraphs; Black Face numbers refer to figures. 



