476 



PAGE 

 Brief Notes on Field Methods Used in Geological Work of Mid-con- 

 tinental Oil Fields, Louis Roark .235 



New Castle Tornado, Brief Notes on, C. C. Beals 219 



O. 



Officers of 1918 11 



Officers of Former Years 13 



Osner, George A., Additions to the List of Plant Diseases of Eco- 

 nomic Importance in Indiana 145 



P. 



Petry, Robert L., Energy Losses in Commercial Hammers , . . . 245 



Payne, Fernandus, Artificial Selection in Bristle Number in Droso- 



phila Ampelophila 249 



Program of Thirty-third Annual Meeting 49 



The Physiography of Indianapolis, Charles R. Dryer 55 



The Pygidiidae, Carl H. Eigenmann 59 



Plastids, D. M. Mottier 97 



Pipal, F. J., A Suspected Case of Stock Poisoning by Wild Onions. . 139 

 Plant Diseases of Economic Importance in Indiana, Addition to the 



List of, George A. Osner 145 



Pollen, Studies on, F. M. Andrews 163 



R. 



Reaction of Culture Media, H. A. Noyes 149 



Resistance of Mucor Zygotes, Mildred Nothnagel 181 



Roark, Louis, Brief Notes on Field Methods Used in Geological Work 



of Mid-continental Oil Fields 235 



S. 



Spring Meeting, Minutes of 39 



Scott," Will, An Epidemic Among the Fishes of Huffman's Lake. ... 67 

 A Study of the Action of Bacteria on Milk Proteins, George Spitzer 



ami H. M. Weeter 91 



Spitzer, George, A Study of the Action of Bacteria on Milk Proteins 91 

 Stock Poisoning by Wild Onion, Allium Canadense, A Suspected Case 



of, F. J. Pipal 139 



Stoppage of a Sewer Line by Roots of Acer Saccharum, F. M. An- 

 drews 165 



Sulphur By-products in the Preparation of Ether, P. N. Evans and 



G. K. Foresman 211 



