INDEX 



439 



Mammals, carnivorous, 312; 



characteristics of, 310; 



examples of, 311; 



hoofed, 314; 



orders of, 311. 

 Man, a mammal, 316. 

 Man's place in nature, 316. 

 Mantle, section of, 260. 

 Manubrium, 198. 

 Marsupials, 311. 

 Matter, defined, 11; 



forms of, 15. See Inorganic and 

 Organic. 

 May fly, 244. 

 Medullary rays, 108, 114. 

 Medusa, development of, 199; 



structure of, 198. 

 Mesenteries, 201. 

 Mesoderm, 193. 

 Mesoglea, 193. 

 Mesophytes, 145, 146. 

 Metamorphosis, defined, 227; 



in butterfly, 233; 



in crab, 223; 



in frog, 280; 



in moth, 236, 237; 



in toad, 283. 

 Micronucleus, 181. 

 Micropyle, 66; 



in ovule, 34. 

 Mildews, 166. 



Milk teeth, dental formula, 333. 

 Milkweed fruit, 77. 

 Mimicry, 235. 

 Mold, growth of, 160. 

 Mollusca, characteristics of, 259. 

 Mollusks, 259; 



boring and harmful, 266, 269; 



classification of, 26: 



cross section of, 260; 



economic importance of, 268; 



habitat of, 268. 

 Monarch butterfly, Hfe history of, 

 233; 



senses of, 233. 

 Monocotyledons, 75, 107. 

 Morphology, defined, 12. 

 Mosquito, development of, 242; , 



relation of, to disease, 243. 



Moss, economic value of, 159; 



life history of, 157; 



parts of, 157. 

 Moth, adaptations in, 239; 



cetTopia, 237; 



life history of, 236, 237; 



harmful larvae of, 238. 

 Moths and butterflies, comparod, 230. 

 Motor nerves, in striated niu.scle 



fiber, 363. 

 Muscle cell.s, 189. 

 Muscles, and movement, 362; 



blood supply to, 364; 



contraction rate of, .364; 



effect of tobacco on, 370; 



extensor, 362; 



flexor, .362; 



in leg of frog, 362; 



necessity of food and fre.<;h air for, 

 366; 



relation of alcohol to, 367; 



rest and exercise of, 367 ; 



structure of involuntary, 364; 



structure of voluntary, 363; 



uses of, in standing, 365; 



uses of, in walkiiifj:, 365; 



work done by, 365. 

 Mu.shroom, parts of, 162. 

 Mushrooms, food value of, 163; 



poisonous, 163. 

 Mussel, 261; 



circulation of blood in, 262; 



circulation of water over gills of, 

 261; 



early development of, 263; 



food getting in, 262; 



locomotion in, 2()2; 



nervou.s .■^v.^toin of, 263; 



shell of, 259. 260; 



structure of, 261. 

 Mycelium, 162. 

 Myriapods, 258. 



Narcotics, 329, 417. See .\lcohol and 



Tobacco. 

 Nectar, defined. 38. 

 Nectar jz;lan(ls. 39. 

 Nectar guidc."^, 39. 

 Nectaries, 39. 



