INDEX ^337 



Page 



Picea ahies 74 



mariana 23, 31, 43, 71, 74. 1,34, 150 



Picus canus 238 



virifiis 238 



Pilea puniila : 90 



Pimephales notatus 20, 25. 24fi, 249 



Finns baiiksiana 21, 31, 48, 49, 50, 53, 59, 70, 74, 114 



resinosa 21, 31, 49, 50, 53, 54, 70, 74, 142, 144 



strobus 21, 49, 50, 51, 54, 59, 60, 70, 74, 134, 142, 144 



Pipilo erythrophthalmus 31, 240, 242, 274, 275, 293 



Pirango eiythromelas 275, 293 



Pisidiuin ahditum , 139, 175 



corapressiim 1 36, 1 76 



rostratum 136, 176 



medianum .• 136, 176 



roperi 150, 176 



splendidulum 136, 137, 176 



streiigii 136, 176 



variabile 136, 176 



vesiculare 136, 176 



Pisobia maculata 237, 241, 275 



miiiutilla 24, 235, 236, 241, 281 



Pisum sativum 209, 212 



Planesticus migratorius 30, 238, 242, 274, 275 



Planorbidae 1 64 



Planorbis campanulatus 24, 133, 140, 141, 165 



minor 137, 165 



bicarinatus 126, 139, 164 



crista 166 



deflectus 130, 138, 166 



exacuous 24, 128, 130, 131, 132, 133, 138, 140, 165 



hirsutus 128, 131, 136, 138, 166 



nautileus 135, 136 



parvus 131, 136, 137, 138, 139, 140, 141, 166 



walkeri 138, 166 



trivolvis 128, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 164, 166 



truncatus 126, 130, 165 



umbilicatellus 138, 166 



Plantago aristata 112 



lanceolata 112 



major 112 



rugelii 112 



Plantauus occidentalis - 96 



Plants 14, 35, 65 



alnus association ; 42, 43, 44 



amphibious formation 38 



arctostaphylos association 48 



beach formation 45 



beaches, plants of 68 



birch-willow association 43 



bog societies 43 



' bush swamp formation ' 42 



calamovilfa-ammophila association : 46 



catalog of 65 



carex association 38, 40 



chara association , 37 



dune formation 46 



dune bushland formation 49 



dune forest formation 49 



dune heath formation 48 



dunes, plants of 70 



ecology of 35 



forest formation .' 44 



fungus formations 55 



43 



