INDEX 



205 



Osmosis, in root-hairs, 44. 

 Ovary, 72, 73, 81, 88. 

 Ovules, 72, 74. 

 Oxidation, definition of, 13. 



liberation of energy by, 66. 



relation of oxygen and carbon 



dioxid to, 67. 

 Oxygen, 6. 



given off by green plants in sun- 

 light, 25. 



supply of, for animals, 25. 



necessity of, for growth, 67. 



Palmately compound, 56. 

 Pansy, 79-82. 



Darwin's experiments with, 82-84. 

 Parsnips, 127, 156. 

 Peaches, 96, 128. 

 Pea, flower, Fig. 35. 



fruit, 89, Figs. 35, 43. 

 Peppermint, 129. 

 Perennials, 158. 

 Petals, 71, 79, 88. 

 Pinnately compound, 56. 

 Pistil, 71, 73, 81, 88, Figs. 24, 28. 

 Pistillate flowers, 87, Figs. 32, B, 34. 

 Pith, 46, 47, 63. 

 Pith rays, 47, 63. 

 Placenta, 89. 

 Plant, family, 160, 170. 



genus, 160, 170. 



species, 161, 170. 



variety, 161, 170. 

 Plants, parts of, 26-31. 



organs and functions, 27. 



microscopic structure, 27. 



cells, 27. 



nutritive organs, 39. 

 Pleurococcus, 169, Fig. 86. 

 Plow, 113, Fig. 50. 

 Plumule, 98. 

 Pollen, 71, 73, Fig. 26. 

 Pollen tubes, 75, Figs. 26, 27. 

 Pollination, 74, 76, 88. 

 Pond scum, 166. 

 Poppy, 129. 



Potato crop of N. Y. State, 122. 

 Potatoes, 107, 127, Fig. 49. 

 Preparations for laboratory, 175. 



Prevention of self-pollination, 84-85. 

 Primary root, 100. 

 Protection of forests, 138-139. 

 Protein, use of term, 13 (footnote). 



composition of, 14, 15. 



test for, 18. 



manufacture of, 24, 61. 



osmosis, 37. 



Prothallus of fern, 162, Fig. 83. 

 Protonema of moss, 164. 

 Protoplasm, 30. 

 Prudden, Dr. T. M., 142. 

 Pumpkin, cross-pollination, 85. 



Quartered oak, 47. 

 Quinine, 129. 



Radiometer, 66 (footnote). 

 Rainfall, regulation of, 136. 

 Raspberry fruits, Fig. 40. 

 Reference books, list of, suggested, 



197-199. 

 Reforesting, 138. 

 Repair of living things, 2. 

 Reproduction, of living things, 3. 



in plants, 70-96. 



Reproductive hyphse of molds, 150. 

 Respiration, definition, 68, 69. 

 Review topics in plant biology, 188- 



196. 



Rhizoids of ferns, 163, Fig. 83, Y7. 

 Rhizome of fern, 162, Fig. 82. 

 Rind, 47. 

 Root-hairs, 40, Figs. 11, 12, 13. 



osmosis in, 44. 

 Roots, structure of, 39-41. 



functions of, 41-43. 



primary, 100. 



secondary, 100. 



aerial, 102. 

 Root-tip, 40. 

 Root-tubercles, 144, Fig. 72. 



bacteria in, Fig. 73. 

 Rotation of crops, 124. 

 Runner, 106. 

 Rusts, 152. 



Sand, 110. 

 Sap, of cell, 30. 



