INDEX 



441 



Man, civilization, 250, 394; 



heredity, 396-401 ; 



in his environment, 21-22 ; 



need of conservation, 369 ; 



place in classification, 250 ; 



races, 251 ; 



see aho Blood, Diet, etc. 

 Maple sugar, 324. 



Marriage, in relation to heredity, 401. 

 Mastication, of food, 152. 

 Mead, Professor A. D., experiment 



with starfish, 361. 

 Measles, 268, 269, 270. 

 Measures, 429. 

 Meats, inspection, 299; 



value as food, 124, 131, 132. 

 Medulla, 200. 

 Medullarv ravs, 88. 

 Melons, 325, 328. 

 Membrane, mucous, 150; 



semi-permeable, 71, 72. 

 Memory, 201. 

 Mendel, Gregor, life, 413; 



work on heredity, 386-389. 

 Mercurochrome, 260. 

 Mesentery, 147. 

 Mesoderm, 227. 

 Metabolism, basal, 132-133. 

 Metamorphosis, 30, 228; 



complete, 30, 229-230 ; 



incomplete, 229 ; 



of butterflv. 29-30; 



of frog, 230 ; 



of house flv, 284. 

 Metchnikoff,"'Elias, 163-164, 411. 

 Micrococci, 266. 



Micronucleus, of Paramecium, 98. 

 Micropyle, 225. 

 Microscope, 44. 

 Midrib, 76. 

 Mildews, 337. 

 Milk, 249 ; 



adulteration, 139; 



care, 300-303 ; 



composition, 119, 128; 



disease germs in, 262, 264, 265, 

 266, 301 ; 



fat globules in, 155; 



grades of, 302 ; 



kept with ice, 296 ; 



Milk, soured, 340; 



supply of, 258-259 ; 



value as food, 121, 123, 129, 132. 

 Milking machines, 4. 

 ]\Iilkweed butterfly, 28, 29. 

 Minerals, needed by plants, 65, 66 ; 



needed in food, 121. 

 Mitosis, 48. 

 JMolds, damage by, 336 ; 



flavor cheese, 336; 



groT\i;h of, 336 ; 



how to prevent, 336 ; 



reproduction, 222. 

 MoUusca, classified, 242, 243. 

 MoUusks, food for man, 348. 

 ^lolting, 229. 

 ISlonarch butterfly, 28, 29. 

 jNIonotremes, 249. 

 Morgan, Thomas Hunt, biologist, 



393, 413. 

 Mosquito, hfe history, 280 ; 



malarial, 279-281 ; 



yeUow fever, 281, 282. 

 Mosses, 236. 

 Mother of pearl. 356. 

 Moths, 26, 27. 

 Motor nerves, 199. 

 jSlountain laurel, pollination, 37. 

 Mouth, 149, 150. 

 Mouth parts, of insects, 34. 

 Mucous membrane, 150. 

 Mumps, 269. 



Muscles, human, 114, 115. 

 Musk, 355. 

 Mutants, 385. 

 Mycelium, 222. 

 Myriapoda, 242. 



Narcotic, defined, 142. 

 Natural selection theory, 383. 

 Nectar, 31, 35. 

 Nemathelminthes, 240. 

 Nerve cell, 198 ; 



fatigue, 212. 

 Nerves, 198, 199. 

 Nervous system, 116, 197-202; 



functions of the parts, 201 ; 



health habits, 202, 213. 

 Neuritis, caused by bad teeth, 151. 

 Neurons, 198. 



