INDEX 



15 



References are to pages 



Matter Continued 



neutralization of acids and 



bases 55-59 



physical changes of . . 52-53, 58 

 planetary movements . 48-49, 58 

 properties of : 



centrifugal force . . . 43-47 



gravitation 47 



electricity and magnetism 



475-501 

 extension .... 42-43,58 



inertia 42-47,58 



weight of 47-48 



Meanders .... 181-183,187 



intrenched 187, 207 



Meat 427-429 



as food 427 



oxidation of 429 



protein in 427-429 



quantity required in diet . . 428 

 Media (of light) .... 354-355 

 Mercury (a planet) . . . 11-13 



day on 12 



distance from earth and sun . 1 1 



orbit of 12 



position of 13 



temperature of 11 



Meridians and parallels 30-37, 39-40 

 degrees, minutes, seconds . 32 

 International Date Line . 35, 40 

 latitude and longitude ... 32 

 measurement of time . . 32-37 



Prime Meridian 32 



Standard Time . . . 34-35, 40 



daylight saving ... 37, 40 



time meridians of ... 35 



Mesas . . '. V .. . -. . 272, 276 



Meteorites 11 



Meteors ........ 11 



heat of 11 



light of 11 



Mica-schist 255 



Microbes . * . 98 



Microscope 356 



Midnight I ' .. . 33 



Milk .... 427,430,446-447 

 a balanced food .... 427-430 



constituents of 430 



dangers from infected . . 446-447 



Milky Way (stars) .... 5 

 Mineral matter in soil . . 310-311 



Minerals 515-520 



Mining . . . 515-521,542-543 

 chief industry of mountain 



regions 542-543 



of coal 254,516-519 



of copper 516 



of gold 516 



of iron 516 



of peat 309, 517-518 



of petroleum 519-520 



of silver 516 



regions of 516 



veins of minerals .... 515 

 Mirage (looming) .... 355, 360 



cause of 355 



Moisture (water-vapor) . 100-107, 

 112, 141, 280, 303, 535 

 a factor in atmospheric 



weathering 280 



a factor in development of 



bacteria, molds, yeasts . . 303 

 a factor in life of animals and 



plants 535 



in air 100-107,141 



Molds 303,399,422 



spores 399 



Molecules (of matter) . 49-59, 67, 

 94, 478-480, 500-501 



atoms 50-51,58 



electrons 500-501 



changes in . . . . . . 53, 58 



compounds .... 54-55, 58 



neutralization . . 55-56, 58-59 



energy in 67, 94 



molecular theory in magnet- 

 ism 478-480 



Monocotyledons .... 375-377 



structure of 375 



Month (origin of) 15 



Moon, earth's . . .2,4,14-17,19, 

 165, 210, 347-351 



a source of reflected light 16, 347, 

 349, 351 



axis of 15 



day and night on ... 15, 17 



diameter of 15 



distance from earth and sun 15, 19 



