458 



INDEX 



Hypocotyl, 126, 185 ; escape of, 



177. 

 Hypogynous, 156. 



Infection, 449. 



Inorganic, 32. 



Insectivorous plants, 218. 



Insect-pollination, 158. 



Integument, 123. 



Internodes, 224, 326. 



Involucre, 380. 



Iris, flower of, 158 ; pollination 



of, 160. 



Irregularity, 133, 156. 

 Irritability, 179. 



Jonquil, 408. 



Laminaria, 16. 



Layering, 232, 329. 



Leaf, 89, 187, 188; compound, 

 190 ; mosaic, 201, 202, 203 ; sec- 

 tion of, 191 ; skeletonized, 189. 



Leaflet, 191. 



Leaves, as vegetables, 378. 



Legume family, 363. 



Legumes, 385. 



Lemon, 395. 



Lettuce, 380, 381. 



Lichens, 58, 59, 60, 61. 



Life of soil, 310. 



Life-relations, 5. 



Light, 301. 



Lily, anther of, 135. 



Limiting factors, 30Q. 



Linseed oil, 415. 



Liverworts, 67. 



Lycopodiales, 101. 



Lycopodium, 95. 



M 



Macrocystis, 16. 

 Maple, fruit of, 170. 



Maple leaf, spot disease of, 435. 

 Marchantia, 69, 70, 71, 73, 74, 



75. 



Mass culture, 334. 

 Meadows, 284, 285. 

 Megasporangium, 108, 109. 

 Megaspore, 108. 

 Megasporophyll, 108, 109. 

 Mesophyll, 194. 

 Mesophytes, 279. 

 Micropyle, 123. 

 Microsporangium, 108, 109. 

 Microspore, 108. 

 Microsporophyll, 108, 109. 

 Midrib, 189. 

 Mildews, 437 ; downy, 47, 48, 49 ; 



powdery, 49, 50. 

 Milkweed, seed of, 170. 

 Molds, 46. 



Monocotyledons, 145. 

 Mosses, 77. 



Motile leaves, 212, 213. 

 Mucor, 45, 46, 47. 

 Mushrooms, 53, 54, 55, 56, 57. 

 Muskmelon, 384. 

 Mycelium, 46. 

 Mycorhiza, 64. 



N 



Narcissus, 408. 

 Nectar, 159. 

 Nepenthes, 219. 

 Nereocystis, 17. 

 Nitrogen, 303. 

 Nodes, 224, 326. 

 Nostoc, 12, 14. 

 Nucellus, 123. 

 Nucleus, 10. 

 Nutrition, 2, 11. 







Oak, 229. 



Oat-production, map showing 



states of greatest, 351. 

 Oats, 351, 352, 353. 



