LIST OF PAPERS PUBLISHED IN THIS REPORT 



PRESIDENT'S ADDRESS 

 The Human Element in Industry. Professor Frank T. Carlton - - - - - 13 



SECTION OF ECONOMICS 



I. L. Sharfman, Chairman. 



The Social and Economic Significance of the Automatic Tool. Ernest F. Lloyd - 29 

 Potential Competition as a Safeguard against Permanent Monopoly. Russel J>. 



Kilbom ----------------37 



Pelatlah Webster and the Revolutionary Currency. Earl V. Dye - - - - 43 



Tne Development of the Acceptance Market in the United States. Ray V. Leffler - 47 

 Farm Incomes. Earl D. Davis ------------55 



SECTION OF PSYCHOLOGY 



John F. Shepard, Chairman. 



Individual Differences in Imagery. Chas. H. Griffitts -------63 



A Study of the Relative Influence of Abilities and Training on Performance. Samuel 



Renshaw — — _ — - — ---_-- — -— 67 

 Some Psychological Problems in the Reconstruction of Education. Gilbert L. Brown 71 

 Location of Sensation of Movement. Z. Pauline Buck - - - - - -—77 



Memory as Afifected by Climax and Anti-climax Arrangement of Material. Henry 



F. Adams ---------------79 



Instincts and Social Ideals in Human Activity. W. B. Pillsbury - - - - 81 



An Account of Some Observation Tests and of a New Stereoscope. John F. Shepard 82 

 Report on Some Correlations of Mental E\inctions —-- — - — — -83 



SECTION OF GEOLOGY AND GEOGRAPHY 



CO. Sauer, Chairman. 



Notes on the Stratigraphy of the Racine Formation of the Northern Peninsula 



of Michigan. G. M. Ehlers -----------87 



Glacial and Glacial Lake Features in the Vicinity of Kalamazoo. Frank Leverett 91 

 Mapping the Utihzation of Land. C. O. Sauer --------93 



SECTION OF ZOOLOGY 

 A. M. Chickering, Chairman 



The Morphology, Structure, and Development of Hydractinia PolycUna J. A. 



Place ----------------97 



The Individuality of the Gerrp-Nuclei dimng the Cleavage of the Egg of Crytobran- 



chus Allegheniensis. Bertram G. Smith ---- — _-- 105 



Mastodon Remains Found in Gratiot County, Michigan. H. M. McCurdy - - 109 

 Division, Nuclear Reorganization and Conjugation in Arcella vulgaris. H. M. 



McCurdy -------------- -111 



Sex Determination in the White-Fly Aleurodes. Norman R. StoU - - - - 113 



The Distribution of the Unionidae in Alaska and British America. Bryant Walker 115 

 Notes on the Presence of Larval Trematodes in theEyesof Certain Fishes of Doug- 

 las lake, Michigan. E. Priscilla Butler - - - - - - - - -116 



The Cestode Parasites of the Perch. George R. LaRuo - - - - - -117 



The Aquatic Adaptions of Pyrausta Peniialis Grt. Paul S. Welch - - - - 118 



The Occurrence of a Species of Echinostomidae in Lams ariimtatus. Wm. Kordes 



Bowen ----------------118 



The Enchvtraeidae (Oligochaeta) Collected by the Canadian Arctic Expedition of 



1913-1916. Paul S. Welch __---------ll9 



Some Observations on the Longitudinal Fission of the Tentacles of Hydra fusca. 



A. M. Chickering ----___------ 119 



Notes on a Specimen of Stylemeys nebracensis. E. C. Case - - - - - -119 



