Vlll INDEX 



PAGE 



Olivia and Caroline Phelps-Stokes Fund for the Protection of 



Native Plants 17 



On Lonely Rocks and Sand-Edged Bhiflfs 170 



Oregon Wild Flowers in Need of Protection 18 



Origin of Parasitism in Fungi 210 



Origin of Species, The Method of Experimentation Upon the . . 231 



Our Forest Policy 8 



Our Opportunity for "Beautifying the Home Grounds" ... 68 



Oxygen Determination, Another Method of 102 



Oxj^gen Determination Method, Improvement of . 102 



Oxygen obtained from Plants, Determination of 76 



Paeonia lutea 207 



Pansies 182 



Parsleys, The 14 



Peonies Again 181 



Petiole Buds, Propagation by 250 



Pine Ridge Agency, S. Dakota, Notes from 11 



Plant Physiology in the High School 258 



Plant Wounds and Natural Pruning 60 



Plants, Determination of Oxygen Obtained from 76 



Plants, Some Unusual Woody 174 



Plants, The Protection of Native 152 



Plants, The Protection of Our Native 123 



Plants, The Relation of to Birds and Insects 69 



Pollination, Field Study of 133 



Pollination in the Primrose 183 



Polyporus, Geotropism of 224 



Popular Botany 310 



Potato, Dry Rot of the 160 



Primrose, Pollination in the 183 



Propagation by Petiole Buds 252 



Propagation of Carnations 45 



Protection of Native Plants, Olivia and Caroline Phelps-Stokes 



Fund for the 17 



Protection of the Wild Flowers 176 



Pruning, Natural, Plant Wounds and 60 



Pure Science and the " Practical " 159 



Pussy Willows 245 



River Botanizing 276 



Roots, a Simple Method of Studying 76 



Roots not Aerotropic 211 



