Pterinea elegans, 97, 98, 99. 



thebesensis, 99. 

 Ptychobranchus phaseolus, 114. 

 Ptyclodus calceolus, 103. 

 Pusey, W. A., 22, 73. 

 Putnam, Joseph R., 15». 

 Quadrula coccineus, 114. 



" •• paupercula, Ho. 



" lachrymosa, 111, 114. 



" pustulosa. 111, 114. 



" pyramidatus, 114. 



" solidus, 114. 



trigona, 111, 114. 

 " undulatus, 111, 114. 



" verrucosa, 111. 



Quercus alba, 122. 



" marceyana, 110, Ho. 

 velutina, 121. 

 Radio-activity and Geological 



Phenomena, 21, 55. 

 Radio-chemistry, 21, 53. 

 Radium from the Astronomical 



Point of View, 21, 50. 

 Rana, 127. 

 Ranatra fusca, 128. 

 Read, J. W., 27. 



Relation of the Soil to Plants. 22. 



Reproduction by Layering in the 



Balsam Fir and Other Conifers, 



28 132 



Rhipidoniella hybrida, 98, 100, 101. 



" simplex, 100. 



Rhus canadensis, 120. 

 Rhynchodus excavatus, 103. 

 Rhynchotreta intermedia. 98. 99. 

 simplex, 101, 102. 

 thebesensis, 99, 100. 

 101, 102. 

 Salisbury, R. D., 11. 

 Savage, T. E., 27, 97. 

 Schuchertella curvistriata, 97, 98, 

 99. 

 " propinqua. 99. 



subplana, 100, 101. 

 Seasonal Succession in Old Forest 



Ponds, 21, 126. 

 Secretary's report, 12. 

 Segmentina armigera, 112, 127. 

 Sephlurus, 127. 

 Shelford, V. E., 25. 

 Sherff, E. E., 26. 

 Slocum, A. W., 14. 

 Solenocaris strigata, 103. 

 Solenopsis molesta, 138. 



Spathiocaris emersoni, 103. 

 Sphaerium rhomboideum, 112. 

 " simile, 110. 



" stamineum, 111. 



" striatinum, 112. 



Spongilla fragilis, 128. 

 Sporangites huronense, 103, 104, 



105, 106. 

 Stenamma brevicorne, 138. 

 Stigmatomma pallipes, 137. 

 Stratiomyiidae, 127. 

 Strophonella, 100. 

 Structure of the Adult Cycad 



Stem, 20, 144. 

 Strumygenys clypeata, 139. 

 Succinea avara, 112. 

 " ovalis, 112. 



Sympetrum obtrusum, 127. 



" rubicundulum, 127. 



Symposium on Radio-activity, 21, 



40. 

 Synthetodus, 103. 

 Tanquary, M. C, 20, 137. 

 Tapinoma sessile, 139. 

 Thysanura, 128. 

 Tilia americana, 122. 

 Transeau, E. N., 21, 25, 27, 143. 

 Trachymyrmex septentrionalis,] 139. 

 Treasurer's report, 14. 

 Triplecia ortoni, 101. 

 Udden, J. A., 15, 20, 27, 103. 

 Unio crassidens. 111, 113, 114. 



" gibbosus. 111, 114. 

 Vaccinium pennsylvanicum, 122. 

 Valvata tricarinata, 110, 112. 

 Viburnum acerifolium, 121. 

 " pubescens, 122. 



VorticelH, 128. 

 Webb, J. M., 20. 

 Weller, Marion, 27. 

 Weller, Stuart, 14. 

 West, J. A., 26, 158. 

 Whitfieldella acuminata, 98, 99. 

 " billingsana, 99. 



cylindrica, 100, 101. 

 " ovoides, 90. 



Wood, F. E., 26. 



Zaphrentis, 100. 



" channahonensis, 98, 99. 



stokesi, 98. 

 Zaetha, 128. 

 Zetek, James, 20, 142. 



