Index. 



359 



MAX 



Maxilla, 301, 304 



Medulla oblongata, 308 



Medullary plate, 260 



Medusoid, reproductive organs of, 

 230 ; structure of a, 227 ; nerve- 

 cells in a, 229 ; sense-organs of, 

 230 



Membra na tympani, 321 



Membrane bones, 304 



Meristem, 120 



Meroblastic segmentation, 329 



Mesencephalon. 308 



Mesenteron, 262 



Mesentery ,242, 272 



Mesoblastic somites, 249, 261 



Mesoderm, 230, 244 



Metabol sm of protoplasm, 34 ; in 

 the animal, 340 ; results of, in the 

 plant, 209 



Metacarpals, 305 



Metameric segmentation, 249 



Metaphyta, 64, 65 



Metastasis, 206 



Metatarsals, 306 



Metazoa, 64, 66 



Metenceph^lon, 308 



Mohl, von, 351 



Molecular motion, it 



Molecule, definition of, 8 



Monocotyledon and Dicotyledon 

 compared, 144 



Motion in animals, 342 



Motor nerves, 317 



Mucous membrane, 267 



Miiller, Hermann, 352 



Multicellular organisms, 64 



Muscle, microscopic structure of, 273 



Myelencephalon, 308 



Myotomes, 258 



Myxomycetes, 71 



"^[ ASAL capsule, 302 



*^ Natural law, i ; phenomena, i 



Nectar, 209 ; glands, 184 



Nectocalyx, 227 



Nematocyst, 225 



Nepenthes, 214 



Nephridium, structure of a, 242 



Nervation, 343 



Nerve-cells, 315; structure of, 314; 

 tissue, elements of, 313 ; fibres, 

 medullated and non-medulteted, 



PEC 



Nervous system, function of, 316 ; 



origin of, in Vermes, 232 

 Neurilemma, 315 

 Neurogloea, 313 



Neuromuscular layer of Hydra, 225 

 Nitrogen, origin of, and importance 



to the plant of, 191 

 Nitrogenous compounds, formation 



of, in the plant, 204 

 Non-essential elements in the ash of 



plants, 194 



Notochord, 252 ; origin of the, 262 

 Nucleoli, 31 

 Nucleus, 30 

 Nutrition of the plant, 197 



A, differentiation of zooids 

 in, 222 ; structure of, 220 ; de- 

 velopment of the embryo of, 231 



Occipital segment of the skull, 301 



Ocelli, 230 



Oil glands, 184 



Olfactory lobes, function of, 317 



Omo-sternum, 305 



Ontogeny, 53 



Open fibro-vascular strand, 180 



Optic tracts, 308 ; thalami, 308 ; 

 lobes, 308, 317 ; chiasma, 308 



Organ, definition of an, 37 



Organs, classification of, 51 



Osmosis, 199 



Otic capsule, 302 



Otocysts, 230 



Ovarium, 85 



Oviducts of Rana, 326 ; of Lum- 

 bricus, 246 



Ovules, varieties of, 163 



Oxidation, 23 



Oxygen, absorption of, by the plant, 

 202 ; origin of, and importance to 

 the plant of, 191 



PALATINE, 302 

 Pancreas, structure of, 281 ; 

 secretion of, 338 

 Pandorina, 83 

 Parasitic Fungi, 100 

 Parasphenoid, 302 

 Parenchyma, 102, 148 

 Parieto-frontal, 302 

 Parthenogenesis, 53 

 Pectoral girdle, 304 



