10 



EVERYDAY SCIENCE 



References are to pages 



Harbors 188,548-552 



advantages of .... 548-552 



necessity of 548-549 



of atolls 549 



of deltas 549 



of depressed coasts .... 549 



of sand reefs and spits . . 549 



of submerged craters . . . 549 



Health and sanitation 99, 107-108, 



112-114, 120, 133, 202-203, 



361-362, 401, 408, 421, 433, 439, 



441-457 



antitoxins of the blood . . 444 

 artificial development of, 



as prophylactics . . . 444 



bacteria vs. . . . 120,361-362, 



401,441-449 



conservation of 457 



corpuscles, white, as disease- 

 fighters 444 



effects of dry and moist cli- 

 mates upon .'.... 108 



humidifiers 107-108 



food and its preparation vs. 



433-434 



laws of 421 



ptomaines vs 439 



sanitation of homes and sur- 

 roundings . . . 202-208, 

 361-362, 443-457 



cleanliness 451-457 



disinfection 361-362, 443-445 

 sewage disposal . . . 449-451 

 water-systems of city- 

 supply . 202-208, 447-449 

 throatal adenoids vs. . . . 408 



toxins vs 444 



ventilation . . 99,112-114,133 

 Hearing ; see Ear ; Sound 

 Heart (engine of body) . . 409-413 



composition of 412 



function of 412-413 



shape of 412 



structure of 412 



Heat .... 2-3,16,18,28-31, 



60-95, 98, 107, 110, 124-127, 



136-139, 209-215, 221, 347, 



350-353, 357, 429-431, 480, 



486-487, 503 



Heat Continued 



adiabatic 125, 221 



air as conductor of ... 107, 215 

 properties of, vs. heating 



systems 110 



animal and plant life affected 

 by .... 62,98,347,508 



boiling in different altitudes 127 

 capacity of water to hold . 139 

 compression of air vs. . . . 124 



conduction of ... 87-88, 94 

 conservation of 64, 90-94, 209-210 

 contraction by ... 65-69, 94 

 convection currents of . 88-90, 94 

 density vs. . . . . . 66,94 



electricity as generator of .62, 

 486-487 



energy generated by . . 60, 93, 



137, 429 



expansion of air vs. ... 107 



factors in .... 211-213,429 



insolation of 209 



intensity of 350 



latent heat 84-86 



light transformed into . . 347, 357 

 magnetism affected by . . 480 



mass vs 66, 94 



measure of .... 80-84, 94 

 molecular movements in . 67, 94 

 production of ... 69-72, 94 



radiation of 90 



reflection of 351-352 



transmittance of ... 209-210 



water vs 136-138 



absorbed in 138 



evaporated by .... 139 



Heat lightning 230 



Heavens, the 1-19 



Hills ; see Mountains 



Honey of bees 405 



Honeycomb 405 



Horizon 355 



" Hot Wind " of Texas ... 229 

 Household .... 117-125,146, 

 254-255, 307, 516-519 

 appliances. . 117-125,486-488 

 bacteria in relation to forma- 

 tion of coal and peat . 516-517 

 borax as aid to emulsion . . 146 



