yO Proceedings of the Ohio State Academy of Science. 



21. Algae of Lorain County, Ohio, with notes on their Distribution. 

 8 min. Susan P. Nichols 



22. Yerba Mate (Paraguay Tea). 10 min. Chas. P. Fox 



23. Mississippian Conglomerates in Northern Ohio. 5 min. G. F. Lamb. 



24. Charts illustrating Feeblemindedness. 20 min. W. F. Mercer 



25. A Supernumerary Appendage in Otocryptops sexspinosus, and a 

 Theory of Heterorythmic Development. 8 min. L. B. Walton 



26. The Soaring Flight of Birds. ,10 min. Lynds Jones 



27. The Aquarium at the Naples Station. 15 min. Stephen R. Williams 



28. Geography of the Balkan Peninsula. (Lantern Slides). 15 min. 



N. M. Fenncman 



29. A Botanical Survey of the Sugar Grove Region. (Lantern Slides). 

 20 min. Robert Griggs 



30. The Application of Physics to Agriculture. A. G. McCall 



31. The Resistance of Aluminum Oxide Films. H. E. Graber 



32. The Differentiation of Diffraction Effects from the Extra Trans- 

 mission of Electric Waves. C. R. Weinland 



33. The Spectrum of Cored Carbons. C. D. Coons 



34. The Effect of a Constriction in a Discharge Tube. R. F. Earhart 



35. The Production of Light by the Firefly. C. R. Fountain 



36. The Hall Effect and Allied Phenomena in Magnetic Alloys. 



A. W. Smith 



37. Twist in Nickel and Steel Rods due to a Longitudinal Magnetic 

 Field. S. R. Williams 



38. The Effects of Temperature and Potential on the Thermionic Emis- 

 sion Heated Wires. Charles Sheard 



39. The Scattering of Gamma Rays by Matter. S. J. Allen 



40. Some Peculiarities of the High Frequency Graphite Arc. A. D. Cole 



41. The Fauna of the Conemaugh Formation. 3 min. Clara G. Mark 



42. A Preliminary Report on the Crayfishes of Ohio. 5 min. C. I. Turner 



43. Induced Modifications in the Pigment Development of Spelerpes 

 larvae. 8 min. A. M. Banta 



44. Review of the Genus Dcro (Aquatic Oligochates) with a Descrip- 

 tion of Two New Species. 5 min. L. B. Walton 



45. The Composition of a Typical Prairie. 5 min. J. H. Schaffner 



46. A List of Plants Collected in Cuyahoga County and New to the 

 County or to Ohio. 3 min. Edo Claassen 



47. The Effects of Changes in Sea Beds on the Fauna and Lithology 

 of the Richmond Period. 10 min. G. M. Austin 



DEMONSTRATIONS. 



Charts showing distribution of Mitosis in the Central Nervous 

 System of Amblystoma as Correlated with Functional Development. 



G. E. Coghill and S. W. Camp 



