438 



INDEX 



House fly, life history of, 24i. 



Humus, 92. 



Hydra, development of, 198; 



food taking in, 197; 



reproduction in, 195, 197; 



structure of, 196, 197. 

 Hydrocarbons, 318; 



tests for, 21. 

 Hydroid colony, 199. 

 Hydrophytes, 144. 

 Hymenoptera, 248. 

 Hypha, 160, 162. 

 Hypocotyl, arched, 68. 



Ichneumons, 254. 

 Indian corn, 62. 

 Inflorescence, 47, 



Inorganic matter, action of root hairs 

 on, 93; 



in living things, 19; 



needed for plant growth, 94; 



relation to organic, 28. 

 Insectivorous plants, 139, 140. 

 Instruments, 14, 429. 

 Intestine, absorption in, 341, 342; 



structure of, 340^ 342; 



glands of, 341. 

 Involucre, 48. 



Joints, as levers, 378 ; 

 ball and socket, 378; 

 dislocation of, 379; 

 gliding, 378; 

 hinge, 378; 



movement by means of, 378; 

 pivot, 378. 



Keel, 36. 



Key fruit, 55. 



Kidney, circulation in, 392; 



effect of alcohol on, 393; 



section of, 392; 



sheep's, 391; 



wastes given off in, 393. 

 Knots, 104, 115. 



Laboratory essentials, 13, 429. 

 Lacteal system, 359. 

 Lacteals, 342, 359. 



Laminated layer of shell, 260. 

 Leaf, compound, 124; 



cross section of, 130; 



dicotyledonous, 124; 



functions of, 132; 



monocotyledonous, 124; 



heliotropism in, 125; 



modifications of, 124, 137, 138; 



photosynthesis in, 133; 



respiration in, 137; 



structure of, 132 ; 



transpiration in, 134; 



venation of, 125. 

 Leaf scar or trace, 103. 

 Leaflike stems, 121. 

 Leaves, arrangement of, 126; 



as food, 141 ; 



effect of light on, 125. 

 Leech, 212. 

 Legume, 50, 53. 

 Lenticels, 104. 

 Lepidoptera, 232. 

 Lichens, 172; 



symbiosis in, 173. 

 Lingual ribbon, 266. 

 Liver, 330, 339. 

 Liver fluke, 213. 

 Liverworts, 159. 

 Lizards, examples of, 287, 288. 

 Lobster, development of, 220; 



economic importance of, 222; 



molting of, 221; 



North American, 216, 220. 

 Locules, 33. 

 Lungs, changes in air in, 384; 



changes of blood in, 385; 



human, 381 ; 



loss from, 384; 



of frog, 380. 

 Lymph, composition of, 358; 



function of, 358; 



glands of, 359. 

 Lymph vessels, 358. 



Macronucleus, 181. 

 Madreporic plate, 204. 

 Malaria, cause of, 185. 

 Malacostraca, 225. 

 Mammals, adaptations in, 312. 



