35* 



Elementary Biology. 



HEA 



Hearing, structure of the organ of, 



320 

 Heat, nature of, 14 ; mechanical 



equivalent of, 16 ; in the animal, 



343 ; in the plant, 209 ; earth's 



internal, 19 

 Heliotropism, 212 

 Hilaire, S. , 350 

 Histoire Naturelle, 348 

 Hoffmeister, 352 

 Holoblastic segmentation, 329 

 Hooker, Sir J., 352 

 Hotsprings. 18 

 Humboldt, von, 350 

 Huxley, 352 

 Hydra, 219 ; nerve cells of, 229 ; 



microscopic structure of, 224 

 Hydractinia, 221 

 Hydration, 23 

 Hydrogen, origin of, and importance 



to the plant of, 191 

 Hydrozoa, 219 

 Hygroscopic water ^ 201 

 Hyoid, 304 

 Hyphae, 93 



Hypoblast, 231, 248, 331 

 Hypocotyledonary axis, 174 

 Hypoglossal nerve, 311 



TLIUM, 305 



* Individual life, 50 



Inertia, 10 



Infundibulum, 308 



Intervertebral foramina, 310 



Intestinal juice, 338 



Intraceliular digestion, 226 



Inulin, nature and uses of, 156 



Iris, 322 



Iron, origin of, and importance to 



the plant of, 193 

 Irritability of protop'asm, 33 

 Ischium, 306 

 Isomerism, 22 



TUSSIEU, De, 349 



KARYOKINESLS, 78 

 Katabolism, 34 ; products of, 

 in the plant, 208 

 Katastates, 34 

 Kidney, 295 

 Kinetic energy, 12 



MAT 



LACTEALS, 282 

 Lamarck, 350 



Laminaria, 91 



Latex, 182 



Laticiferous vessels, 182 



Leaves, arrangement of, 185 ; 

 types of, 185 



Leeuwenhceck, 348 



Lens of the eye, 324 



Lenticels, 182 



Lieberkuhnian follicles, 278 



Light, nature of, 14 ; effect on orga- 

 nisms of, 45 



Lilium, reproductive organs of, 

 157 ; s ructure of the flower of, 

 158 ; life-history of, 143 ; structure 

 of the root of, 150 ; structure of 

 the leaf of, 152 ; structure of the 

 stem of, 145 ; structure of the 

 floral axis of, 146 



Linnaeus, 348 



Liver, structure of the, 279 



Lumbricus, nephrida of, 236 ; 

 clitellum of, 236 ; protective 

 system of, 242 ; n spiratory 

 system of, 241 ; nervous system 

 of, 244 ; reproductive system of, 

 246 ; ccelomic fluid of, 240 ; 

 structure of the body- wall of, 

 244 ; purificatory system of, 241 ; 

 cuticle of, 244 ; circulatory system 

 of, 239 ; sense organs of, 245 ; 

 circulation of, 240 ; alimentary 

 system of, 236; haemal fluid of, 

 240; differentiation of organs in, 

 234 ; locomotory system of, 242 ; 

 external characters and habits of, 

 233 ; development of the embryo 

 of, 247 ; nutrition of, 238 ; pro- 

 stomium of, 235 ; renal system of, 

 241 



Lungs, structure of, 291 ; develop- 

 ment of, 293 



MAGNESIUM, origin of, and 

 importance to the plant of, 



193 



Mandible, 301, 304 

 Manubrium, 228 

 Manuring, 195 

 Mastication, 336 

 Matter, states of, 10 ; fundamental 



properties of, 7 ; constitution of, 9 



