April, 1919] Report Ohio Academy of Science 315 



Scientific Sessions 

 The complete scientific program of the meeting follows: 



Presidential Address 



"The Origin of the Cerebral GangHa of the Vertebrates," 



F. L. Landacre 



Symposium on Science and the War 



The Work of the Ground vSchools in the Training of the Air Forces of the 



United States F. C. Blake 



Modern Methods of Plant Disease Control W. G. Stover 



Psychological Tests in the Army George F. Arps 



Methods of Teaching the Theory of Flight in Schools of Aeronautics. .H. C. Lord 



Topography and the War on the" Western Front T. M. Hills 



The Newer Demands on Physics and Physics Teachers Due to the War .... 



E. H. Johnson 



Papers 



1. Notes on Distribution of North Atlantic Bryoza. 10 min. (Lantern), 



Raymond C. Osburn 



2. The Economic Value of the Ephemerida. 5 min Chas. P. Fox 



3. A Peculiar Habit of the Rusty Grackle. 3 min Edward L. Rice 



4. Remarks on Leaf Hoppers on Hawaiian Islands. 8 min. . . .Herbert Osborn 



5. The Fauna of a Series of Rock-bottomed Ponds. 15 min. (Lantern), 



F. H. Krecker 



6. The Habits of the Folding-door Spiders. 20 mm W. M. Barrows 



7. The Subterranean Life of Meadows and Pastures. 10 min. Herbert Osborn 



8. Opalina and the Origin of the Ciliata. 25 min Maynard M. Metc.\lf 



9. The Bryozoan Gizzard. 3 min Raymond C. Osburn 



10. Free-swimming Larval Colonies of Pectinatella from Black Channel, 

 Cedar Point. 8 min Stephen R. Williams 



11. Anatomy of Echinorhvnchus sp. 8 min. 



C. F. McKhann, Jr., introduced by Stephen R. Williams 



12. The Effect of Certain Ductless Gland Extracts on Plant Tissues. 10 min. 

 (Lantern) R. A. Budington 



13. Our Knowledge of Ohio Crustacea. 5 min Raymond C. Osburn 



14. A List of Ohio Spiders (now in press). 5 min W. M. Barrows 



15. A Preliminary Survev of the Protozoa of Mirror Lake on the Ohio State 

 University Campus. '6 min Mabel E. Stehle 



16. Application of Colloid Chemistry to Nephritis. 15 min. .Hazel C. Cameron 



17. Reaction Time in the Blind and the Deaf. 5 min A. M. Bleile 



18. The Effect of Radium Radiations on the Germ Cells of Drosophila 



ampelophila. 20 min W. M. Barrows 



19. Studies of Vaso-motor Balance. 15 min. 



Clyde Brooks, Clayton McPeek and R. J. Seymour 



20. Note on the Catalase Content of the Turtle Heart. 4 min R. J. Seymour 



21. Pneumococcus Types. 5 min Carl L. Spohr 



22. The Cancer Problem. 20 min. (Lantern) Ernest Scott 



23. Behavior of the X-chromosomes in Branchipus vernalis. 5 min. 



R. C. Baker 



24. Work of the Plant Disease Survey, U. S. D. A. in Ohio. 10 min. . . A. D. Selby 



25. The Lecidaeceje of Ohio. 15 min. (Lantern) Bruce Fink 



26. Interesting Ascomycetes. 10 min. (Lantern) Bruce Fink 



27. A Revised Course for Secondary Botany. 15 min Blanche McAvoy 



28. Succession on Prairies. 20 min. (Lantern) Homer C. Sampson 



