428 



INDEX 



Hairs, how they grow . . . 361 



structure 361 



Heat, and humidity .... 365 

 causes changes of matter . 112 

 causes expansion . . . . Ill 

 loss from body .... 364, 365 



unit of 327, 330 



Heart, a double force pump . 382 

 work of .... 377,382,383 



Hemlock 271 



Hippocrates 2 



Home medicine chest . . . 407 



Hot springs 232 



Human body, a machine . 354-355 



an engine 353 



Human body and engine com- 

 pared . 309, 351, 354, 353, 355 

 building materials . . . 356-357 

 Human machine, an organism 358 

 and training ...... 389 



differences between it and 



auto 354-355 



Humus 214 



Hunter, John 1, 2 



Indians, keen observers 

 used smoke signals 



Insect, diagram of 



Inspiration .... 



Insulators .... 



Intestine, large . 

 small 



Iodine, test for starch 

 uses of, in body . . 



Iron in body . . . 



3 



130 

 274 



71 

 177 

 378 

 378 

 311 

 322 

 323 



LaBreaPits 223,225 



Larvae, dragon fly .... 286 



mosquito 286 



Lava, flow 216 



Lavoisier 44 



Leaves, functions of .... 261 



where placed 260 



Levers, bony 355 



Laboratory 336 



Lichens 3 



Life, a series of changes ... 16 



comes from life 253 



depends on environment . . 255 



in pond 282 



in tidal pools .... 297, 300 



in sand or mud 296 



on earth changing . . . 224, 226 



on the rocks 296-297 



origin of 252-253 



tree of 298-299 



Life zones, in mountains . . 290 

 in pond 282 



intertidal 295 



shore 294, 295 



Ligaments 370 



Light, absorbed 134 



diffused 139-140 



how we use 129, 152 



law of reflection . . .136, 137 



properties of 134 



reflected 134 



refraction of 140, 141 



transmitted 134 



Lightning 177 



Limestone 237 



Living stuff, analysis of . .317, 322 



Living things, are responsive 254, 255 



are sensitive . . . 249, 250, 255 



grow 253 



made of cells 254 



Magdeburg experiment ... 57 

 Magnet, the earth a . 165, 171, 172 

 Magnets, how named . . . 165 



how to make 167 



permanent 167-168 



properties of 167-173 



what will they attract . . 167 



Magnetic boat 184 



field 170, 171 



Magnetic poles 169-179 



law of 170 



Man, an efficient machine . . 327 

 and his environment ... 37 



Maple 271 



Maps, star . . 201,202,204,205 



Matter, nature of 13 



Mica 218 



Microorganisms 335 



Milk, a perfect food . . . 324, 325 



and bacteria 340-342 



Milky Way 206 



Millipeds 276 



Minerals, in body .... 322, 323 



hardness 219 



Mirrors, curved .... 138, 139 



how we see in 137 



Mold spores 334 



Molds 336 



Mollusks 274 



Mussels, fresh water .... 285 



Moths 274 



Mosquito larvae 286 



Mountains, life zones . . 289, 290 



old 234 



young 235 



Mulches 240 



dust 240 



paper 240 



