278 ELEMENTS 
Movements toward light, 111, 112. 
Mucronate, App., *264. 
Mulberry, #189. 
Multiple fruits, #189, 190. 
Musci, 210. 
Mushroom, study of, 228-250*, 
Mutilated seedlings, growth of, 12, 
#15. 
Mycelium, *223. 
Myrsiphyllum, *62. 
Myxogasteres, 210. 
Myxothallophytes, 2 
a 
0. 
Naked buds, #88. 
Nasturtium leaves, starch in, 139, 
#140. 
Natural selection, 206. 
Nectar, 170. 
Nectar-glands, 170 
Nectar-guides, 172. 
Nectaries, 170. 
Negundo, radial and cross-sections 
of stem of, #70. 
Netted-veined, #98, 
Nettle, stinging hair of, *126. 
Nightshade, leaf of, *124. 
Nitrogen, 140. 
Nocturnal position, #109, *110. 
Node, 26, 65. 
Nucleus, #43. 
Nucleus of root-hair, *46. 
Nut, #186. 
Nutrient substances, 137-140. 
ras 
#0, 
Oak leaves, arrangement of, 105, 
*106. 
Oat, root-system of, 39. 
Obcordate, App., *264. 
Obovate, App., *263. 
Obtuse, App., *264. 
OF BOTANY 
Odors of flowers, 170, 171. 
Offensive-smelling plants, 125. 
Oil, 18, 19. 
Oil, essential, 21. 
Oil, extraction, 18, 19. 
Oil, testing seeds for, 19, 20. 
Onion, bulb of, 59. 
Onion leaf, section of, *61. 
Onion, structure of, 84, 85. 
Onion, tests for food-materials in, 
85. 
Obgonia, #220, *221. 
221. 
2, 106, #107, #108, 
ar) 
Odsphere, #220 
51, 
Opposit e 
*100. 
Orbicular, App., ? 
) 
63. 
Orchid, aérial roots of an, 30. 
Organs, essential, *148. 
Organs, vegetative, 24, 
Osmosis, 45-47%, 
Osmosis in an ege, 45, #46. 
Osinosis in root-hairs, #46, 47. 
Ovary, #153, 154-156. 
a 
Ovate, App., 
Ovule, 153, #154. 
Ovule, spruce, fertilized, #260. 
Ovule, structure of, #166. 
Oxalis leaf, development of, *94. 
Oxidation, 10. 
Oxygen, 10, 136. 
Oxygen-making, 137. 
Palisade-cells, *128. 
Palmate, 100, #102, 103. 
Pampas region, 204. 
Panicle, #193, App., *267. 
Pansy, leaf-like stipules of, *101. 
Papilionaceous corolla, *150. 
Papille on stigma of a lily, *165. 
