920 



SCIENCE 



[N. S. Vol. XXXVII. No. 963 



"The Teaching of Economics in the High 

 School." Discussion opened by J. E. Mitchell, 

 of Alma College, and F. M. Taylor, of the Uni- 

 versity of Michigan. 



*"The Taxation of Local Public Utilities in 

 Michigan," E. H. Ryder, of Michigan Agricul- 

 tural CoUege. 



"Public Utility Accounting in Michigan," 

 David Friday, of the University of Michigan. 

 Discussion opened by H. C. Adams, of the Uni- 

 versity of Michigan. 



SECTION OF ZOOLOQT 



Thursday, April 3 



"Factors Governing Local Distribution of the 

 Thysanoptera, " A. P. Shull. 



"Results of the Mershon Expedition to the 

 Charity Islands, Lake Huron Coleoptera," A. W, 

 Andrews. 



' ' Types of Learning in Animals, " J. F, 

 Shepard. 



"The Lepidoptera of the Douglas Lake Region 

 Cheboygan County, Michigan," Paul S. Welch. 



' ' Check-list of Michigan Lepidoptera. II, 

 Sphingidee (Hawk Moths)," W. W. Neweomb. 



*' ' On the Breeding Habits of the Log Perch, ' 

 Jacob Reighard. 



"A List of the Pish of Douglas Lake, Cheboy 

 gan County, Mich., with Notes on their Ecological 

 Relations, ' ' Jacob Reighard. 



"May the Remains of Adult Lepidoptera be 

 Identified in the Stomach Contents of Birds?" 

 F. C. Gates. 



' ' The Mitochondria, ' ' R. W. Hegner. 



"The Unione Fauna of the Great Lakes," 

 Bryant Walker. 



"Notes on the Genus Edaphosaurus Cope," E. 

 C. Case. 



' ' Methods of Preparing Teleost Embryos for 

 Class Use" (demonstrations), B. G. Smith. 



*"An Adult Biemyctylus with Bifurcated 

 Tail," B. G. Smith. 



"Notes on the Mollusks of Kalamazoo County, 

 Mich., ' ' Harold Cummins. 



*' ' Sarcoptid Mites in the Cat, ' ' Harold Cum- 

 mins. 



*"The Origin of Continental Forms, III.," 

 Howard Baker. 



"An Ecological Study of the Birds of Man- 

 chester, Mich.," F. Gaige. 



"Notes on Crustacea Recently Acquired by the 

 Museum of Natural History of the University 

 of Michigan," A. S. Pearse. 



"Distribution of Multiple Embryos on the 

 Blastoderm," O. C. Glaser. 



*" Nesting of Our Wild Birds," Jefferson 

 Butler. 



*' ' The Factors that Determine the Distribution 

 of Boleosoma nigrum in Douglas Lake, Cheboygan 

 County, Mich., " H. V. Heimburger. 



"Structure of the Olfactory Organs," E. W. 

 Roberts. 



' ' A Method of Producing Cell-like Structures by 

 Artificial Means," E. W. Roberts. 



' ' Some Notes on Rhizopods from Michigan, ' ' 

 E. W. Roberts. 



"An Interesting Form of Protozoa," E. W. 

 Roberts. 



*' ' Oxygen and Carbonic Acid Contents of Doug- 

 las Lake, Cheboygan County, Mich., " D. A. Tucker. 



"Some Observations on Asplanchna amphora," 

 D. A. Tucker. 



' ' Some Effects of Sunlight on the Starfish, ' ' H. 

 M. MacCurdy. 



"Some Abnormalities Observed in Proteo- 

 cephalid Cestodes," G. LaRue. 



' ' Note on a Cestode Found in a Garter Snake, ' ' 

 G. LaRue. 



*' ' Some Observations on Intestinal Villi, ' ' O. 

 M. Cope. 



' ' Some Physiological Changes in the Lamprey 

 Egg after Fertilization," P. Okkelberg. 



' ' A Collection of Fish from Houghton County, 

 Mich.," T. L. Hankinson. 



"The Lagoons and Ponds of Douglas Lake, 

 Cheboygan County, Mich.," H. B. Baker. 



' ' The Shiras Expeditions to Whitefish Point, 

 Mich.": (1) " Birds, " N. A. Wood. (2) "Mam- 

 mals," N. A. Wood. (3) "Amphibians and Rep- 

 tiles," Crystal Thompson and Helen Thompson. 



"Notes on the Ornithology of Clay and Palo 

 Alto Counties, Iowa," A. D. Tinker. 



"A Check-list of Michigan Mammals," N. A. 

 Wood. 



"The Variations in the Number of Vertebrae 

 and Ventral Scutes in the Genus Cegina," Crystal 

 Thompson. 



' ' An Artificially Produced Increase in the Pro- 

 portion of Male Producers in Hydatina senta," 

 A. F. Shull. 



SECTION OP BOTANY 



Thursday, April 3 



"Biometric Studies in Oaks" (with lantern), 

 Carl Oberlin. 



"Biometric Studies in Oaks" (with lantern), 

 J. H. Ehlers. 



