INDEX 



References are to pages 



Abdo'men 410 



Acids 54-59,315 



neutralization of . . . 55-59, 315 



Adenoids 408 



Adiaba'tic cooling and heating 



124-125, 221 



Agricultural soils ; see Soils 

 Air .... 96-134, 135, 141, 152, 

 209-226, 279-283, 311, 313-314 

 425, 443, 445, 483 

 adiabatic cooling and heating 



of 124-125, 221 



atmosphere (earth's envelope 

 of air) . . . 96-^97, 114, 115, 

 120, 132-134, 141, 152, 209-213, 

 279-280, 313-314 



bacteria in . 98-99, 120-122, 443 

 composition of . 97-100, 132-133 

 compression of 123-125, 133-134 

 condensation of . . 104, 125-126 



density of 116, 132 



evaporation of moisture in 



100-107, 133 



expansion of ... 109, 123-125, 

 133-134 



humidity of (absolute ; rela- 

 tive ; saturated) . 102-107, 133 



hygrometer 103 



liquid air 125 



precipitation of moisture in 



101-104 



pressure of ... 110, 114-125, 

 127-134,210-211 

 saturation of moisture in 



102-103, 104, 106, 112, 141 



temperature 100-107, 



109-110, 112, 125-128, 134 



vacuum of 117-118 



ventilation . . 99,112-114,133 



Air Continued 



water vapor in .... 98-108, 

 112, 127, 133, 141 



weight of .... 99, 108-110, 



114-115, 129-131, 133 



winds 110, 125, 215-226, 281-283 



Air sacks 408 



Air tubes 408 



Alcohol . . 105, 140, 431-432, 457 



abuses of 431-432 



evaporation of 105 



solvent, as 140 



Alimentary canal .... 419-421 



Alkali soils 332 



Alkalies 55 



Altitudes ....... 132, 134 



Ammonia (a gas) 127 



Angles of incidence and reflec- 

 tion 352 



Angleworm ; see Earthworm 



Animals 98-100,166, 



311-319, 345, 366, 399-421, 423, 

 425-458, 522-553 

 classification : 

 by distribution : 



amphibia 532 



land animals . . 536-541 

 sea animals . . 166, 532-536 

 phosphorescence . 533-534 

 by structure : 



invertebrates . 400-405, 423 



insects 400-405 



protozoa 400-401, 423, 452 

 breeders and car- 

 riers of disease 401, 452 

 see also Bacteria 



shellfish 400 



worms .... 317-319, 

 345, 401-402 



