INDEX 



345 



Metamorphosis of Honeybee, 252, 253*, 



254- 



Metaphase of mitosis, 30*, 31. 

 Metaplasm, 26, 27*. 

 Metathorax, 236. 

 Metazoa, 5, 29, 33, 71, 100, 103, in, 112, 



22Q. 



Microgamete, 89*, 90, 91, 96, 98. 

 Microgametocyte, 89*, 90, 91. 

 Micromere, 185*. 



Micronucleus, 60*, 67, 68-71, 81. 

 Micro-organism, 10. 

 Migration, 276, 285. 

 Millipede, 225, 227*. 

 Mimosa pudica, 18. 

 Mind, 305. 

 Mining bee, 265*. 

 Mite, 225, 228. 

 Mitosis, 29, 30*, 31-32, 67. 

 Mole, 277. 

 Mollusca, 6, 7. 



Molt: Crayfish, 216, 217, 218; Honey- 

 bee, 253. 

 Monoecious, 149. 

 Morphology, 2. 

 Morula, 108, 109*, no. 

 Mosquito, 88, 89, 90, 91, 92. 

 Moss animals, 5. 

 Motor nerve cell, 178, 179*. 

 Motor neuron, 179*. 

 Mouth, 4: Ascaris, 160; Crayfish, 195*, 



200, 216; Earthworm, 167, 168*, 186; 



Euglena, 82, 83*; Hydra, 117, 118*; 



Paramecium, 59, 60*, 68, 81 ; Planar la, 



154*, 155- 



Mouth parts of honeybee, 235*-236, 254. 

 Mucous gland, 248. 

 Miiller, J., 246, 271, 272, 273*. 

 Muscle, 168, 169; fibers, 101*, 119. 

 Muscular system, in, 159: Crayfish, 



209 ; Honeybee, 239-240 ; . Planaria, 



155- 



Muscular tissue, 101*. 

 Mutant, 295. 



Mutation, 281 ; theory, 274, 295-297. 

 Myocyte, 148. 

 Myoneme, 101. 

 Myriopoda, 225, 227. 

 My sis, 229*, 230*, 231*, 232. 



Nageli, 35. 



Natural selection, 293-294. 



Nauplius, 216, 226, 230*, 231, 232, 299*. 



Nectar, 235-236, 257. 



Nemathelminthes, 5, 7, 163. 



Nematocyst, 5, 120*, 121*, i22*-i23, 125, 

 139- 



Nephridiopore, 166*, 167. 



Nephridium, 166*, 173, 174, 175, 176. 



Nephrostome, 175-176*. 



Nereis, 190, 191*. 



Neuron, 179*; theory, 178. 



Nervous system, 17, in: Ascaris, 161 ; 

 Crayfish, 195*, 205 ; Earthworm, 176- 

 180*, 177*, 179*; Honeybee, 244^245, 

 2 53; Hydra, 125; Planaria, 154*, 

 IS5-I56. 



Nervous tissue, 101-102. 



Niata oxen, 281. 



Nitrogen, in protoplasm, 21. 



Nucleolus, 27*, 32, 84. 



Nucleoplasm, 27*. 



Nucleus, 26, 27*, 28, 30, 31, 35 ; division, 

 29-33, 3*; in fertilization, 105*, 106 : 

 Ameba, 37*, 38, 39; Euglena, 83*, 84; 

 Paramecium, 60*, 68, 69, 70, 71. 



Nutrition, holophytic, 85 ; holozoic, 85 ; 

 saprophytic, 85 : Crayfish, 201 ; Earth- 

 worm, 170-171 ; Euglena, 85; Grantia, 

 148; Paramecium, 66-67. 



Obelia, 139, 140*, 142. 



Ocelli, 235*, 245. 



(Enothera lamarckiana, 295. 



(Esophagus: Crayfish, 195*, 200; Earth- 

 worm, 1 68*, 169, 170; Honeybee, 

 240, 241*, 253. 



Oligochaeta, 190, 192. 



Old age, 14, 71, 72. 



Ommatidium: Crayfish, 206*, 207*; 

 Honeybee, 245. 



Ontogeny, 108, 229. 



Onychophora, 225, 226, 227. 



Oocyte, 104*, 105*, 106. 



Oogenesis, 103, io4*-io6: Crayfish, 211; 

 Earthworm, 184-185; Grantia, 149; 

 Honeybee, 250; Hydra, 118*, 135-136*. 



Oogonia, 104*. 



Ookinet, 89*, 91. 



Ophthalmic artery, 195*, 202. 



Optic lobe, 216, 217*, 244*. 



Optic nerve, 207. 



Optimum, 76, 88. 



Oral groove ; 59, 60*, 65, 81. 



