490 



INDEX 



Shell-mounds, ancient, in the Aleutian 

 islands, 437 



Shufeldt, Dr., on affinity of goat- 

 suckers and owls, 123 (note) 



Sickle-bill humming-bird, 321 



Sidgwick, Mr. A., on protective 

 colouring of moths, 46 



Simocyonidae, 165 



Sitta, sexual colouring and nidification 

 of, 126 



Sittella, sexual colouring and nidifica- 

 tion of, 126 



Size, correspondence of in tropical 

 flowers and insects', 406 



Skull, the Calaveras, 447 



Sky, colour of not mentioned in oldest 

 books, 413 



Smith, Mr. Worth ington, on mimicry 

 in fungi, 397 



Smyth, Professor Piazzi, on the Great 

 Pyramid, 430 



Snakes, mimicry among, 72 



characteristics of tropical, 304 



Sobralias, 256 



Soil, heat of, 222 



influence of temperature on cli- 

 mate, 223 



Solenopsis, genus of ants, 281 



Song of birds, instinctive or imitative, 

 104 



Sorby, Mr., on composition of chloro- 

 phyll, 395 



Spalding, on instinctive actions of 

 young birds, 109 



Sparrow learning song of linnet and 

 goldfinch, 105 



Species, law of population of, 23 



abundance or rarity of, dependent 

 on the adaptation to conditions, 

 26 

 diversity of opinions as to, 454 



Speed of animals, limits of, 160 



Sphecia craboniforme, 64 



Sphecomorpha chalybea, 68 



Sphegidaj, mimicked by flies, 69 



Spices from equatorial forest - trees, 

 245 



Spiders, which mimic ants and flower 

 buds, 70 



remarkable tropical, 291 



Spilosoma menthastri, 63 



Spruce, Dr. Richard, on habits of 

 Indians of Peru, 107 



Spruce, Dr., on number of ferns at 

 Tarapoto, 253 



on inconspicuousness of tropical 

 flowers, 264 



Stainton, Mr., on moths rejected by 

 turkeys, 56, 63 



Stalachtis, a genus of Erycinidee, the 

 object of mimicry, 60 



St. Helena, 9 



Stick-insects, 287 



Stinging insects generally conspicu- 

 nisly coloured, 52 



St. John, Mr., on large python, 305 



Stone mortars in auriferous gravels of 

 California, 445 



Streptolabis hispoides, 66 



Structure of humming-birds, 313 



Struggle for existence, 23, 25 



Sturnidae, sexual colouring and nidifi- 

 cation of, 127 



Sturnopastor, 123 



Sugar from palm-trees, 250 



Sun-birds, differences from humming- 

 birds, 334 



Sun's noonday altitude in Java and 

 London compared, 221 



Sun's rays, heating effect of, 221 



Sunrise in the equatorial zone, 233 



Survival of the fittest, law of, stated, 

 26 



its action in determining colour, 

 48 



Swainson's circular and quinarian 

 theory, 34 



Swallows, various forms of nests of, 

 114 



Swifts, resemblances of to humming- 

 birds, 333 



and humming-birds, Dr. Shu- 

 feldt on supposed affinities of, 

 337 (note) 



Sylviadae, sexual colouring and nidifi- 

 cation of, 128 



Symmachia trochilus, 274 

 colubris, 275 



Synapta, 136 



TACHORNIS phaenicobea, 116 

 Tanagridse, sexual colouring and nidi- 

 fication of, 127 

 Tapir, ancestral types of, 165 

 Telephori, similar colouring of two 

 i sexes, 80 



