552 



INDEX 



Submarines, conning tower of, 330 



image found in, 329 



periscope of, 329 

 Sugar, 183 



grape, 184 

 Sun, amount of light given off, 462 



daily course of, 92 



eclipse of, 326 



heat of, 463 



in conjunction and opposition, 466 



size of, 463 



slant of rays, 91 



spots on, 463 



weight of, 137 

 Sunlight as a germicide, 323 

 Sunset, color of, 335 

 Swamp root, evolution of label, 247 



Tartar on teeth, 223 

 Taurus, 480 

 Teeth, care of, 222 

 Telegraph, alphabet, 407, 408 



instrument, 407 

 Telephones, 435 



changes in current, 437 



habits, 438 



receiver, 437 

 Temperature, 122 



Btu. and calory, 128 



chart of, 124 



color of iron indications of, 126 



determination of, 125 



in gasoline engines, 127 



of space, 87 



of sun, 87, 124 



question of, 133 



useful table of, 125 

 Tenacity, 446 

 Tetanus, 307 

 Thermometer bath, 122 



Centigrade, 119 



clinical, 122 



diagram of, 120 



Fahrenheit, 119 



Thermometer, history of, 119 



maximum and minimum, 123 



Reaumur, 119 



use of, 121 

 Thermos bottle, 98 

 Thunder storm, 395 

 Tides, flood and ebb, 466 



spring and neap, 467, 468 

 Time, standard, 458 



sun and train, 460 

 Tones, compound and simple, 422, 423 



fundamental, 425 



from string instruments, 426 



partial, 425 

 Tornadoes, 74 

 Torricelli, 49 

 Translucent, 325 

 Transparent, 325 

 Traps, water, 285, 286 

 Tubercles, 318 



on plant roots, 318 

 Tuberculosis, 303 



bacillus of, 303 



contraction of, 304 



fake cures for, 252 



origin, 303 



prevention of, 304 



source, 303 



symptoms of, 304 



treatment of, 304, 305 

 Typhoid fever, 300 



fly of, 301 



prevention of, 301 



Uranus, 473 



Vaccination, 296 



care of, 297 

 Vacuum, partial in gas burners, 159 



partial in bottle, 40 

 Vanilla, extract of, 243 

 Vegetable, cooking of, 223 

 Ventilation, 171 



and convection, 110 



