Index 



661 



law Cont'd 



defined, 7 



of electrical charges, 205, 630 



of gravitation, 7-8 



of magnetic poles, 197, 630 

 Lazear, Dr. Jesse, 543 

 lead, 29, 452, 630 

 leap year, 151 

 leaves, 491, 493, 494, 497-501, 504, 



506, 507, (498) 

 Leeuwenhoek, A. Van, 577 

 legumes, 444, 630 

 lens, 630 



concave, 187, 188, 189 



convex, 187, 188, 189 



of the eye, 187, 188, 189, (188, 

 189) 



photographic, 188, 582 

 lenticels, 493, 630 

 lever, 243-246, 630, (244, 246, 248) 



classes of, 244-247, (246) 

 Leyden jar, 206, 630, (206) 

 lice, 541 



Liebig, J. Baron, von, 577 

 life processes, 630, (see functions) 

 life, science and, 552-553 

 lift pump, 52, (52) 

 ligaments, 481, 630 

 light, 151, 165, 180-194, 315, 511, 

 583, 586, 630 



artificial, 92, 180, 190-193, 

 231-232, 568, 573, 592-594, 

 (232) 



camera and eye, 188 



diffusion of, 185 



energy, 67, 180 



heat and, 151, 190, 231 



infra-red, 582-583 



necessity for green plants, 492, 

 497 



rays, 181, 185-187, 189 



reflection, 183-184, 582, 586, 589, 

 (183) 



refraction, 185, 186, 187, 637, 

 (186) 



shadows, 182, 183, 639, (183) 



speed of, 102, 165, 181, 185, 236, 

 571 



sun as source of, 102, 151, 180- 

 181 



transmission, 180, 181, 182, 185 



ultra-violet, 582 



light Cont'd 



waves, 180, 181-182, 186, 582 

 year, 165, 630 

 lightning, 136, 203, 206-207, 517, 



630, (207) 

 lime, 51, 372 

 limestone, 31, 291, 294-295, 322, 



(294) 

 Lindbergh, Col., 281, 283, 284, 



(283) 

 lines of force, 199, 216-217, 630, 



(199, 216) 

 liquid, 14, 88, 89, 103, 630 



fuels, 91 

 Lister, Joseph, 473. 552, 564-565, 



577 



litmus paper, 63, 357, 630 

 Little Bear, 161-162, 163, (163) 

 Little Dipper, 162-163 

 liver, 401, 403, 405, 413, 420, 425- 



426, 630, (401, 420) 

 loam, 302, 630 



lockjaw, 457, 563 (also see tetanus) 

 locomotive, 18, 259-262, 266-267, 



(17, 259, 260, 267, 607) 

 lodestone, 195, 196, 198, 630, (196) 

 log, 277, 548 



longitude, 157, 159, 277, 630 

 loudspeaker, 237, 585, 630, (235) 

 low pressure areas, 131, 132, 133, 



134, 140 



lows, 134, 144, 145, 630, (144) 

 lumber, 516 

 lunar month, 155 

 lungs, 325, 339-343, 346, 347, 350, 



417, 418, 420, 425-426, 631, (341, 



342, 420) 

 lye, 63, 631 



lymph, 404, 420-422, 631 

 lymphatics, 421-422, 631 

 lyra, 161, 163, (163) 



M 



macadam roads, 256, 631 

 machines, 242-254, 631, (244, 246, 



247, 248, 249, 250, 251, 252) 

 uses in home, 62, 63, 217, 221- 

 222, 226, 229, 231, 234-238, 242, 

 245-246, 463, 499-501, 553 

 Macon, 279, (280) 

 magnesium, 29, 30 



