INDEX 



299 



Hail, 209 



Hair follicles, 246 



structure of, 277 

 Hearing, 285, 286 

 Heart, 260, 262, 263 



beat, 262 

 Heat affected by latitude, 86 



and direction of sun's rays, 86 



and electricity, 209 



and living things, 87 



and respiration, 88 



distribution of, 85 



latent, 62 



of fusion, 63 



of vaporization, 63 



specific, 69 



transference of, 83 

 Hiccough, 273 

 Hot-water heating, 98 

 Humidity, 107 



absolute, 107 



relative, 107 

 Hybridizing, 229 

 Hydrometer, 41 

 Hygrometer, 108 



Ice-cream freezer, 88 

 Images, persistence of, 154 

 Inertia, 173 

 Inorganic bodies, 211 

 Insulators of electricity, 202 



of heat, 84 

 Intestines, 253 

 Invar, 57 

 Invertebrates, 221 

 Iris, 287 



J 



Japan current, 98 

 Joints, 239 



K 



Kidneys, 280 

 Kilocalorie, 69, 252 



Lacteals, 261 



Lantern, projection, 153 



Larynx, 269 



Latent heats, table of, 63 



Latitude, 181 



Lens, crystalline, 287 



Lenses, 152 



double concave, 152 



convex, 162 

 Levers, 189 

 Ley den jar, 202 

 Lianes, 221 

 Ligaments, 240 

 Light, 149 



and phosphorescence, 155 



composition of, 160 



effect of prism upon, 161 



effects of, 154 



energy used by plants, 155 



rays, direction of, 149 

 infra-red, 162 

 ultra-violet, 162 



reflection of, 150 



speed of, 22, 149 



vibrations of, 22 



white, 160, 163 

 Lighting, artificial, 156 



indirect, 156 

 Lightning, heat, 203 

 Lines of force, 196 

 Liquids, 14 



convection in, 97 



free surface of, 15 

 Liver, 255 

 Lodestone, 194 



