26 



INDEX 



References are to pages 



Mosquitoes, breeding places . 41 



members of Diptera .... 20 



Moss, composition of cushion of 364 



two generations of 366 



Mosses, and their allies . . . 3(54 



classified 7 



general features 364 



habitat 364 



life history of (fig.) .... 3(55 



number of 7 



types of (fig.) 364 



Moths, carriers of pollen . . . 304 



example of Lepidoptera ... 20 



Moths and butterflies, field 



study of 33 



Motile cells (sperms) of moss 



plants 365 



Motor function 213 



Mourning" cloak butterfly 



(fig.) 29 



Mourning- dove (fig.) .... 143 



Mouth, cavity of earthworm . 81 



of man 164 



parts of grasshopper (fig.) . . 14 



Movements of plants . . . 392 



Mucus, use of, by clam ... 96 



Mucous membrane .... 182 



Muscle, bundle 188 



Muscle cells, heart (fig.) . . 189 



involuntary (fig.) 189 



voluntary (fig.) 188 



Muscles, color of 188 



involuntary 188 



of man . . , 184 



of upper leg (fig.) 188 



scars of clam 96 



voluntary 188 



Mushrooms, edible fungi . . 354 



poisonous 233 



Mustard, a common plant fam- 

 ily ....... . .323 



Mutton, value of, as food . . . 



Muzzling of dogs 



Mya arenaria, edible clam . . 



Myriapods, discussed .... 



Myrtle warbler, at suet station 



328 

 178 

 250 

 100 

 92 

 148 



N 



Nails, origin of 190 



Narcotic, defined 221 



Nasal cavity of fish .... 109 

 Nasturtium, twining petiole of 



(fig-) 292 



use of petioles in 294 



Natural gas, formation of . . 375 

 Natural laws, basis of success 



in agriculture 320 



Nectar, relation to pollination 



by butterfly 30 



sought by insects 297 



use of, to flowers 389 



Needle-like leaves of pine 377, 378 



Nephridia of earthworm . . 83 



Nereis, an annelid worm ... 84 



Nerve cells (fig.) .... 209, 211 



of mollusks 98 



Nerve fibers, defined .... 209 



description of 211 



gray substance of 211 



white substance of 211 



work of 210 



Nerve pathways in midbrain 119 



Nerve trunk 222 



Nerves, cranial, of frog ... 119 



location of 119, 210 



of earthworm 82 



of frog 118 



of mollusks 98 



Nervous system, function of, 



in locomotion 2 



growth of 211 



of crayfish 90 



of earthworm, front end of 



(fig-) 82 



of frog (fig.) 118 



of man (fig.) 209, 210 



parts of 209 



summary of 230 



Nest, of bittern (fig.) .... 142 



of chimney swift (,fig.) . . . 144 



of yellow warbler (fig.) . . . 142 



Nest-building of birds . . . 142 



Net-veined leaf 272 



Nighthawks, destroyers of 



mosquitoes 42 



food of 145 



Nightshade family, character- 

 istics of 334 



Nissl bodies 225 



Nitric acid, test for protein . . 265 



