662 



Index 



magnet, 195-197, 204, 215-226, 631, 

 (196, 197, 199) 



earth as a, 195, 200 

 magnetic, 



compass, 195, 197, 603, (197) 



field, 199, 216, 223, 631, (199, 216) 



force, 199, 215 



lines of force, 199, 216, (199) 



needle, 195, 198, 215, 631 



poles, 196, 199, 200, 215-217, 223, 

 636 

 law of, 197, 630 



properties, 195 

 magnetism, 195-202, 215-217, 631 



induced, 195, 198, 628, (198) 



theory of, 199 

 magnetite, 195, (196) 

 magneto, 225, 631 

 mail service, 282, 548 

 malaria, 324, 454, 541-543, (542) 

 malnutrition, 471, 472, 631 

 malt, 378, 531 

 mammals, 418, 631 

 man, early life of, 3-5, 48, 67, 81, 

 83, 101, 105, 148, 161, 190-191, 

 242, 255, 258-259, 266, 270-272, 

 354, 369, 453, 546-552 

 mantles, 192, 631 

 many-celled animals, 324-327 

 marble, 291. 295, 631, (295) 

 Marconi, Guglielmo, 549 

 mariner's compass, 162, 195, 197- 

 198, 272, 277, 548, 603-605, 

 (197) 



Mars, 150, (149) 

 match, 83-84, 191 

 matter, 12-16, 20-21, 631 



atomic theory of, 22-23, 617 



changes in, 16, 19 



composition of, 22-33, 312 



conservation of, 15-16, 621 



defined, 12 



elements of, 23, 28-30 



expansion and contraction of, 

 82, 87-88, 103-104 



kinds of, 12, 19, 20, 290, 298, 301, 



(13) 

 molecular theory of, 22, 82 



properties of, 14-15, 16 



states of, 14 



measurement of power, 75, 212, 243 

 meats, 369-371, 445, 447-448 



mechanical advantage, 243, 245, 



247-250, 631 



mechanical energy, 223, 631 

 medicinal plants, 501, 531 

 medium, 441, 631 

 medulla, 431-432, 631 

 megaphones, 178 

 membrane, 174, 176, 313, 314, 341, 



342, 383, 399, 402, 413, 493, 494- 



495, 631 



meningitis, spinal, 457, 474, 631 

 mercurial barometer, 39, 40, (40) 

 mercury, 29, 39, 40, 86-87, 583, 



631 



Mercury (planet), 150, (149) 

 meridian, 632 



of Greenwich, 157-159 

 prime, 157, 159, 160 

 metals, 28-30, 81, 297 

 metamorphic rocks, 290-291, 632 

 metamorphosis, 542, 632, (542) 

 metazoa, 324, 632 

 Metchnikoff, Professor, 393 

 meteor, 150, 632 

 meteorograph, 121, 632 

 meteorology, 140, 632 

 methyl alcohol, 380, 632 

 Michelson, Albert A., 571, 577, 



(571) 



microbes (see germs), 35, 448, 632 



microorganisms, 451, 452, 454, 632 



beneficial, 59, 378, 441, 443-444, 



529 

 conditions favorable to growth, 



440, 442-443, 445 

 control of, 445-448, 449, 465-466, 



541 

 forms of, 316, 379, 439-445, 448, 



460 

 harmful, 370, 393, 404, 411, 441, 



445, 448, 453-454, 457, 469, 543, 



551 

 protection against, 370, 445-448, 



469 



reproduction, 440 

 where found, 379, 441-444 

 microphone, 234, 235, 237, 590, 632, 



(234) 



micropyle, 505-508, 632 

 microscope, 22, 632 

 middle ear, 175, 176, (775) 

 midrib, 497, 632 



