INDEX 



13 



References are to pages 



Life Continued 



composition of 366 



dependence upon : 



air .... 98-100, 141, 152, 

 210,313,425 



earth 366 



heat 347 



light 347,364 



soil-elements . . . .302,311 



sun 366, 384 



water .... 135,311,425 

 development of forms of 



522-523, 539-540, 552 

 differentials as to animals 



and plants 366 



distribution of ... 524-525, 

 537-541,552 

 effects of : 



climatic changes .... 525 

 Glacial Period . . .525-526 

 physical features of sur- 

 face . . 277-278,523-524 

 water . . 151-152, 166-167 



of ocean 166-167 



embryo of .... 388-389, 394 

 fertilizer of soil, as . . . . 318 



food, as 419 



necessary for . . 313-314, 366 

 growth of .... 151-152, 366 

 man in relation to other 



forms of 425 



microscopic, necessary to 



other life 311 



of the land . 257-263, 535-544, 



552 



of the ocean . . . 531-535, 552 



of the soil .... 311-319,345, 



401-402, 535 



phosphorescence of ... 533-534 

 physical conditions of earth 



vs 522-553 



powers of 366 



propagation and reproduc- 

 tion 366,524-525 



similarity in low forms . 399-400 



Light .... 2-9,16,18,37,40, 



60-62, 93, 209, 347-365, 



486-487, 533-534 



color 356-364,390 



Light Continued 



comfort vs 361 



conservation of . . .37, 40, 362 

 direction of movement of 347-349 



disease vs 361-362 



electricity a generator of 



487-488, 501 



energy generated by . . 61, 93, 

 357, 501 



essential to life .... 347. 364 

 intensity of ... 349-350, 364 

 moon as chief source of, at 



night 16, 349, 351 



properties of 348 



reflection of 348-349,351-352,364 

 refraction of ... 353-356, 364 



spectroscope 358,364 



spectrum . . . 357-358,364 

 speed of .... 352-353,364 

 stars as lesser lights at night 



4-9, 347 



sun as chief source of . . 2-3, 18, 

 60, 93, 347, 364 



artificial lighting . 347, 362-363 

 moon and stars as lesser 

 lights . . . 4-9, 16, 347, 349, 

 351 



theories of Newton as to . . 361 

 Lightning (electricity in) . . 483 



lightning rods 483 



Limestone (sedimentary rock) . 254 



Liquids 42,58 



Lisbon (earthquake and ocean- 

 wave) 514 



Listerine (disinfectant) . . . 445 

 Litmus paper (in acid and alkali 



tests) 54-55,58 



Liver 421 



Loadstones . . . 37-40,475-480 



attraction of 476-477 



field of force 476-477 



intensity of attraction . . 477 



poles of 39, 40, 476 



Loam 309-310,345 



Local soil (sedentary) . . . 307 

 Loess beds (deposition) . . . 285 



Longitude 32 



Looming (mirage) .... 355-360 

 " Loss of energy " . . 63, 462-463 



