INDEX 



549 



Milk, article manufactured from, 226 



bacteria in, 229, 230, 231, 232 



bicarbonate of soda in, 228 



boron compounds in, 228 



composition of, 226 



formaldehyde in, 228 



foreign matter in, 229 



grades of, 230, 231 



hydrogen peroxide in, 229 



mineral matter in, 227 



pasteurization of, 229 



sources of, 225 



solid in, 228 



test for bacteria in, 240 

 Milk separators, 497 

 Mineral matter, food containing, 202, 

 204 



in milk, 227 



required daily, 202 



use of, 204 

 Mirrors, kind of, 331 



parabolic, 331 

 Mist, 25 

 Moisture, air losing, 33 



getting into the atmosphere, 1 



in the atmosphere, 11 



other ways of getting into atmosphere, 

 3 



questions on atmosphere, 19 



why air loses, 33 



warm air holds more moisture, 2 

 Molecule, theory of, 443 

 Monazite sand, 156 



cerium and thorium from, 156 

 Monsoons, 74 

 Mosquito, anopheles, 294 



culex, 294 



destroying, 295 

 Moon, 464 



dry and wet, 465 

 Moon in conjunction and opposition, 466 



man in, 466 



phases of, 465 



surface of, 464 



Motion picture, machine, 339 



taking of, 341 

 Motor, 391 



commercial, 392 



trolley car, 392 



Mountains, effect on rainfall, 37, 38 

 Music, 419 

 Myopia, 344 



Needle, amount worn, 433 



Neptune, 473 



Nitrogen, 136 



Node, 417 



Noise, sound and tone, 417 



sympathetic, 420 

 North star, as pointer, 454 

 Nostrums, 245 



Objects, why seen upright, 361 

 Ohms, 400 



Oils, Bach's table of reactions, 244 

 Oil, drying, 138 



fire extinguisher, 140 



wells, 135 



Oleomargarine, 240 

 Olive oil, 244 

 Opaque objects, 326 

 Ophuichus, 487 

 Opsonin, 308 

 Opsonic index, 308 

 Optical illusions, 361-363 

 Orbits, 357 

 Orion, 484 

 Osmosis, 447 

 Overtone, 243 

 Oxidation, 137 



prevention of, 138 



slow, 137 

 Oxygen, amount in the air, 136 



experiment with, 135 



in rocks, 138 

 Oxy hemoglobin, 186 



Paint of radiating surfaces, 



