INDEX. 243 



PAGE. 



Hydra, red 125 



Hyponitrites , method of preparing , 82 



Igneous rocks of central Caucasus 101 



Iowa Brick Company 62 



Park and Forestry Association 59 



Bill approved by 59 



State College sewage plant 70 



Keyes, C. R. , Devonian hiatus in continental interior 105 



Igneous rocks of central Caucasus 101 



Recent uprisings of shores of Black Sea 103 



Kinderhook formation 107, 109, 111, 112 



King, Charlotte, vascular cryptogams of Iowa 134 



Knight, Nicholas, some new double bromides 127 



Lee county, Florida, plants collected in 189 



L,oess 155 , 156 



Loess bluflfs , plants of 177 



Loewinson-Lessing, work of 101 



Longitudinal or sound wave, model illustrating 36 



Lycopodium coynplanatum 151 



lucidiilurn 15 1 



Meek and Worthen, work of 109, 110 



Menke's hypouitrite 84 



Menke's method 82 



Methyl alcohol 86 



Mt. Pleasant sewage, analysis of 79 



Myers, E. C. , chemical composition of sewage 70 



Onoclea sevsibilis 148 



Strulhiopieris 148 



Osborn, Herbert, factors of extinction 47 



Osmtmdia cinnaniomea 150 



Clavtoniana 149 



regalts 149 



Owen, D. D 108 



Pammel, L. H. , preliminary notes on flora of western Iowa 152 



Vascular cryptogams of Iowa 134 



Paroxymetamethylacetophenone 113 



Pella beds, Rhizopods in 120 



Pelkva atropurpurea 142 



i^rarilis 141 



Phegopteris calcarea 145 



dryopleris 144 



hexagonopiera 144 



polypodioides 144 



Plants collected in Lee county, Florida 189 



Plant formations 167 



Pleuroptyx, in Coal Measures 121 



Pohpodium vulgare 139 



Presidential address , 21 



Pteris aquilina .... 140 



Pure food laws 18 



