INDEX 



209 



Maxillipeds, 176 

 May flies, 184 

 Meat, 54 



Mechanism, 42, 44 

 Membrane (see Moist mem- 

 brane ) 

 Mesoderm, 93, 136, 139, 143 

 Metamorphosis, 161, 172, 180, 



183, 184 

 Microbes, 79 

 Milk, 54 



Millipeds, 181, 183 

 Mites, 181 

 Moist membrane, 13, 15, 16, 24, 



25, 29, 31, 32, 33, 42, 43 

 Mollusca, 154-161 

 Molluscoidea, 171, 172 

 Moulting, 179 

 Mosquito, 184 

 Mother of pearl, 159 

 Motion, 10, 13, 14, 15, 21, 45, 



99 

 Moths, 184 



Motor (efferent) nerves, 113 

 Mouth, 148 

 Mouth parts, 182 

 Movements, 10, 99, 110, 111, 



113, 115, 150 

 Muscle, 57, 150, 185; cells, 



100; relation to bones, 110, 



111; of respiration, 36, 42; 



structure of, 100, 101, 102, 



114 

 Muscular contraction, 99, 100, 



101 

 Muscular energy, source of, 46, 



100 

 Muscles, work of, 84 

 Mussel, 158 

 Myriapoda, 181 



Nails, 187 

 Narcotic, 118 



Nephridia, 160, 167, 169, 179 

 Nerve cell, 112 

 Nerve cord, 169, 180, 182 

 Nerve fiber, 112 



Nerves, 113, 114, 180, 181, 185 



Nerves, relation to muscles, 111 



Nervous system, 112-117; of 



coelenterata, 143; of echino- 



dermata, 113, 150; of mol- 

 lusca, 158, 159; of vermes, 

 113, 169; of arthropoda, 173- 

 175, 181; of vertebrata, 187 



Nettle cells, 140 



Nitrogen, 20, 29, 53, 61 



Nitrogenous compounds, 169, 

 186 



Noises, 42 



Non-living matter, 11, 87 



Non-sexual reproduction ( see 

 Fission, Budding) 



Nucleus, 9, 20 



Nutriment, 53, 54 



(Esophagus, 57, 99, 139, 150, 



151 

 Oils, 52 

 One-celled animals, 9, 10, 11, 



29, 43, 46, 88, 125, 128-134 

 Organism, 7, 9, 16, 21 

 Osmosis, 15, 16, 22, 32, 58, 60, 



72, 81, 132, 141 

 Ovary, 91, 169 

 Ova (see Egg-cell) 

 Oviduct, 94, 167 

 Oxidation, 22, 117 

 Oxygen, 16, 17, 18, 19, 20, 23, 



28, 29, 31, 32, 33, 34, 40, 41, 



42, 43, 44, 52, 53, 77, 78, 92, 



117, 132, 141, 151, 157, 160, 



174, 180, 186, 190 

 Oxyhemoglobin, 77 

 Oysters, 103, 159 



Pancreas, 186 



Pancreatic juice, 56, 58 



Paramecium, 10, 88, 130 



Parasites, 171 



Parthenogenesis, 176 



Particles, 13, 14, 15, 16, 24, 43 



Pearl oyster, 159 



Pelvic girdle, 105 



Pepsin, 56 



Peptones, 56, 58 



Peristaltic action, 54, 57, 102, 



179 

 Perspiration, 61, 62, 83 

 Phosphorus, 53 

 Physics, 2, 3 



