3 8o 



INDEX 



Medicines, purpose of, 33-36, 65, 78 

 Mercury, boiling and freezing tem- 

 peratures, 142 



coefficient of expansion, 141 



properties of, 141-142, 146-147 

 Metabolism, 174-175 

 Metals, 188-189, 194-205 



importance of, 196-197 

 Milk supply, 226, 308-311 



pasteurization of, 309 

 Mind, 8-9, 65-66 

 Molecules, 85-86, 173-174, 181 

 Moment, 165-167 

 Momentum, 166-167 

 Moon, 157, 353, 355-358 



number of moons for other 

 planets, 358 



phases of, 355, 358 



physical characteristics, 357-358 

 Mosquitoes, 39-40, 6c-6i 

 Mouth, 4-6, 8-9 



connected parts, 4-5, 9 

 Narcotics, 73-79 

 Natural resources, 103-105, 107, 218, 



254-256, 284-287 

 Nerves, 2-3, 5, 8-9, 31, 33, 79 



nerve shock, 236, 239 

 Nitrogen, 112-113, 2 57 



Obliquity of solar rays, 147-149, 351- 



'352 



Oils, 231, 272-273 

 Ores of the metals, 194-201 

 Osmosis, 99-101 



osmotic pressure, 100 

 Oxidation, 16-18 

 Oxygen, 16-18, 175, 226 



liquid oxygen, 117-118 



Pain, n, 33, 35 



Paint, 203, 208, 272-273 



Paper, 273-274 



Parasites, 40 



Pasteur, 36, 39 



Patent medicines, 76-77, 79 



Pendulum, 359, 362 



Perspiration, 27-29 



Petroleum, 284-288 



Phenomena, 152 



Planets, 337~338, 353, 367-369 



Plant growth, conditions for, 243, 

 247-251, 253 



Plants, studies of, 263-274 

 flowers, 265-266 

 leaves, 263-265, 267-270 

 propagation of, 266-267 

 roots, 243-244, 248-249, 263, 267 

 seeds, 265-266 



usefulness of plants, 255-259, 

 263-265, 268-274 



Play, 69-71 



Pollen, 265-266 



Potato, 229 



Poultry, 297-303 



structure of bodies of fowls, 

 297-298 



Poverty, 73, 212-213, 290-291 



Preservatives, 47-48, 51, 307 



Producers, 281-283 



Proteins, 27, 220, 222-225, 231, 299- 



300, 328 

 test for, 301 



Protoplasm, 64, 71, 79, 222, 226 



Protosynthesis, 228 ^ 



Protozoa, 36-38, 40 



Ptomaines, 41, 47 



Public health, 47-51 



Pulleys, 164 



Pumps, 122 



Pure foods, 48, 51 



Q 



Quarantine, 43, 45 



Questions, lists of, 15, 30, 51-52, 63- 

 64, 84, 97, 101, 108-109, 123, 

 131-132, 140, 150, 158-159, 



