i:n^dex 



439 



Primula imperialis, small range, 19 



Proteid molecule, complexity of, 

 383 



Prothylacinus, a Patagonian mar- 

 supial, 240 



Protoplasm, its chemical nature, 

 315 



Pteranodon occidentalis, skeleton of, 

 226; longiceps, skull of, 227 



Pterodactyl, restoration of long- 

 tailed, 22G 



Pterodactylus spectahilis, skeleton 

 of, 225 



Ptychoceras emeridanum, 290 



Purpose of our universe to produce 

 variety of human character, 299, 

 421 



Pyrothebia, 251 



Queensland, flora of, 58 



Rabbits, increase of in Australia, 

 123 



Radiolaria, 362 



Radium, its rarity and uses, 389 



Ramsay, Sir A., on life of the Cam- 

 brian age, 207 



Recognition by butterflies, 181 



Recognition-marks important for 

 evolution, 168; explained, 170; 

 objection to answered, 178; gen- 

 eral conclusions on, 185 



Religion, gradual rise of a true, 

 302 



Reptiles, earliest, 214 



Reptilian life of secondary period, 

 227 



Retrogressive development in 

 birds, 309 



Rhizopoda, 362 



Rice-bird, diagram of variation of, 

 118 



Ridley, Mr., on flora of Singapore, 



79 

 River-basins, rate of denudation of, 



189 

 Roscoe, Sir H., on properties of 

 carbon, 388; on water in relation 

 to life, 391 



Saleeby, Dr., on eternity as an ex- 

 planation, 379 



Sap, extreme production of, 299 



Sauropterygia, 223 



Scales on wings of buttciilics, .'l-i.") -. 

 apparent purpose of, 327 



Scelidosaurus harrisoni, skeleton of. 

 218 



Sceloditherium leptocephalum, skel- 

 eton of, 255 



ScLATER, Dr. P. L., on species of 

 birds, 94 



Seeboiim, H., on food of birds in 

 Arctic regions, 146 



Seton-Tiiompson on recognition- 

 marks, 172 



SiiARPE, Dr. B., on species of birds, 

 94 



Shipley, A. E., table of described 

 animals, 99 



Simethis bicolor, one locality of in 

 Britain, 27 



Singaporp:, flora of, 79; destruction 

 of forest in, 85 



Sisymbrium sophin, power of in- 

 crease of, 121 



Small-brained animals, purpose of, 

 306 



South Africa, Cape Region, flora 

 of, 79 



South America, tertiary mammals 

 of, 249 



Spalacotherium, 229 



Sparrows at Rhode Island, work of 

 natural selection on, 138 



Species defined, 12; distribution of, 

 13; uncertainty of limits of, 25; 

 rarity of precedes extinction, 26; 

 number of, in relation to evolu- 

 tion, 100; variation of. 113; ex- 

 tremely common, 114; to be seen 

 everywhere, 115 



Spencer, H., on co-ordination of 

 variations, 275; reply to, 276, 

 277; his " unkno^^^l reality" 

 more concretely expressed, 430 



Spirit-life described (inspiration- 

 ally) by Poe, 428 



Springbok, curious recognition- 

 mark on, 174 



Spruce, Dr., on rich flora of Ama- 

 zon, 61 



Sterrolophus fJabeJIatus, skull of, 

 219 



Stone-curlews, recognition marks 

 of, 175 



Sydnetx", extreme abundance of or- 

 chids near, 41 



Table of De Candolle's botanical 

 regions, 20; of chief natural 

 orders in various floras, 22; of 

 number of species in large and 

 small areas. 28; of numln^r of 

 species in difTerent latitudes, 31: 

 of floras of European oonntries 

 according to latitude, 31; of 



