378 



INDEX. 



Orders among animals, 6; 228-236; 

 their gradation, 41 



Ordinal analogy, 275 



Ordinal identity, 22 



Organised beings, their relations to 

 physical causes, 13, n. 



Organs without function, 12 



Origin of animals and plants, 15, n. 



Ornamentation a specific character, 

 259 



Other natural divisions among ani- 

 mals, 261-264 



OTTO, his work with CAIUS, 37, n. 2 



Oviparous animals, 131, n. 1 



OWEN (D. D.), his work, 145, n. 1 



OWEN (R.), his works, 24, n.; 37, n. 2; 

 61, n. 2; 101, n. 1; 125, n. 1 and 3; 

 136, n. 3; 145, n. 1; 153, 2 and 3; 

 163, 163, n. 2; 299, n. 3; his clas- 

 sification, 325; his investigations 

 upon the fossils of Australia, 153 



PANDER, his works, 125, n. l;351,n. 1 



Parallelism between the geological 

 succession of animals and the em- 

 bryonic growth of their living re- 

 presentatives, 168-175 



Parallelism between the structural 

 gradation of animals and their em- 

 bryonic growth, 178-181 



Parallelism between the geological 

 succession of animals and plants 

 and their present relative standing, 

 159-168 



Paramecium, genus of Infusoria based 

 upon embryos of Planaria 



Parasites, 45 



Parasitic animals and plants, 186-191 



PEACH, his paper, 105, n. 



Pedicellina forms the connecting link 

 between the ordinary Bryozoa and 

 Vorticellas 



PEIRCE (BENJ.), his discovery of the 

 relations between the laws regu- 

 lating revolutions of the members 

 of our solar system and the arrange- 

 ment of leaves in plants, 193 



PERCHERON, his work, 45, n. 1 



Period of Linnaeus, 302-308 



Period of Cuvier and anatomical sys- 

 tems, 308-336 



Permanency of specific peculiarities of 

 all organized beings, 75-84 



PERTT, his works, 113, n. 2 



PETERS (W.), his paper, 118, n. 1 



PFEIFFER, his work, 44, u. 3 



Pheasants do not exist in America, 62 



PHILLIPS, his works, 142, n. 4 



Phyllotaxis, 193 



Physical causes, 16, n. ; 21, 23, 47, 47, n. 



Physiophilosophers, 235 



Physiophilosophical systems, 336-350 



PICTET, his works, 142, n. 4; 144, n. 1; 

 145, n. 1; 148, n. 1; 156, n. 6 



Pisces, see Fishes 



Plagiostoms, their development, 123, 

 n. 1 ; constitute a distinct class, 

 133, n. 1 



Plans of Structure, 34 



Plan of structure characterizes the 

 branches of the animal kingdom, 207 



Plants, their geological succession, 

 150, 167 



PLIENINGER, his work with H. v. 

 Meyer, 145, n. 1 



POLE, his paper, 163, n. 1 



Polymorphism among Acalephs, 137, 

 u. 1 ; among Polyps, 137, n. 1 ; 

 among Mollusks, 137, n. 1; among 



Articulata, 137, n. 1 



Polycistince no animals, 290, n. 



Polyps, their standing, 40; their limits 

 as a class, 287, n.; their character- 

 istics, 222; their development, 169; 

 the freshwater Polyps are Bryozoa, 

 with the exception of Hydras, 44, n. 



POMPPER, his work, 46, n. 



POUCHET, his works, 31, n. 1; 110, n. 1 



POWELL, his work, 3, n.; 11, n.; 17, n.; 

 76, n. 



PREVOST, his papers, 109, n. 1; 110, 

 n. 1; 122, n. 1; 124, n. 2; 125, n. 1; 

 125, n. 3 



Primates, their standing in the sys- 

 tem of Linnaeus, 230 



Primitive limits of distribution of 

 animals, 58 



Progressive types, 177 



Prophetic types among animals, 175- 

 178 



Proportions characterize species, 249 



PROSCH, his paper, 136, n. 3 



Protozoa as a primary group of the ani- 

 mal kingdom,113;287;289; 333,n.l 



Proteus anguimis, 20 



Protozoa, 113; as a primary group of 

 animals, 287, 289 



PROUT, Bridgwater Treatise, 12, n. 



Psorospermia, 116 



PURKINJE, his work, 101, n. 2 



PUSCH, his work, 142, n. 4 



