INDEX 



547 



Heat, of space, 87 



produced by solidification, 130 



regulations of, 168-9 



sensible, 129 



specific, 131 



saving of, 168 



table of specific, 131 



water carries, 101 



warm air furnace, 106 



vapor steam, 108 



production of without oxygen, 137 

 Heating systems, 110 



diagrams of, 104, 106, 108, 109 

 Highs, 63 

 Honey, 244 

 Hookworm, 313 

 Humidity, 12 



absolute, 130 



measured, 13 



of desert, 12 



of school rooms, 12 



relative, 13 



relation to bodily heat, 13 



table, 14, 16, 17 

 Humor, aqueous, 358 



vitreous, 358 

 Hurry, 505 

 Hyades, 480 

 Hydra, 486 

 Hydration, 183 

 Hydrochloric acid and baking soda, 



223 



Hydrogen peroxide, test for, 229 

 Hydrometer, 261 



use of, 261 

 Hydrophobia, 297 

 Hygrometer, construction of, 14 



paper, 15 

 Hygroscope, 15 

 Hypermetropia, 344 



Ice, manufacture of, 5, 6 

 .Iceless cooler, 7 

 Indestructibility, 445 



Illumination, amount of, 365 



method of, 365 

 Images, effect of object distance on, 335 



in plain mirrors, 329 



real, 327 



virtual, 327 

 Impenetrability, 444 

 Inertia, 447 

 Ink stains, 272 

 Insulations, 388 

 International date line, 457 

 Iris, 355 

 Isobars, 67 

 Isotherms, 67 



Job's coffin, 488 

 Jupiter, 473 



Kindling-point, 140 



temperature of, 140 

 Kite, up in air, 76 



Lachrymal apparatus, 359 

 Latitude, 460 

 Lenses, concave, 345 



convex, 346 



different kinds, 349 



development of, 335 



flat and meniscus, 351 



for automobiles, 336, 337 



for eye, 349-356 



for lighthouse, 338 



for stereopticon, 338 



focus of, 335 



on a slant, 353 



of eye, 334, 335 



range of vision in, 351 



spherical, cylindrical, prismatic, 351 



varieties of, 351 

 Leo, 484 



Lemon extract, 243 

 Lever, 491 



first class, 49, 492 



