16 The Ohio Journal of Science [Vol. XXI, No. 1,. 



Scientific Sessions. 

 The complete scientific program of the meeting follows: 



Presidential Address. 



II 



The Einstein Theory of Relativity and Gravitation," 



F. C. Blake; 



Public Lecture. 



"Photographing Sound Waves from Large Guns and Pro- 

 jectiles" Dayton C. Miller 



Symposium Before Physics Section. 



The Constitution of the Atom: 



(a) The Planetary Atom of the Physicist ". S. J. M. Allen 



(b) Why Not One Kind of Atom Only? R. C. Gowdy 



(c) Discussion, led by W. L. Evans 



Papers. 



1. Claws of Arachnids W. M. Barrows 



2. The Arizona Boll Weevil (Anthonomus grandis var. thurberia) with 



Special Reference to Steps Taken by the Arizona Commission of Agri- 

 culture and Horticulture to Prevent its Establishment in Cultivated 

 Cotton. Read by title Don C. Mote 



3. Aphelopus theliae (Gahan) and the Changes Produced in Thelia by this 



Parasite. 15 min. (Lantern) S. L Kornhauser 



4. The Intestinal Parasites of Overseas Troops as Compared with Home 



Service Troops. 10 min S. L Kornhauser 



5. A New Disease, Black Tumor, of the Catfish. 5 min R. C. Osburn 



6. Classification of the Opalinidse. 10 min Maynard M. Metcalf 



7. Geographical Distribution of the Opalinidag. 1.5 min. . .Maynard M. Metcalf 



8. Factors in the Distribution of Aquatic Snails in Lake Erie. 20 min. 



(Lantern) F. H. Krecker 



9. Caddis- fly Larvae as Agents in Distribution of Fresh Water Sponges. 5 min. 



F. H. Krecker 



10. Notes on Some Tropical Homoptera. 8 min Herbert Osborn 



11. Generic and Specific Characters from the Male Genitalia of Syrphidae 



(Diptera). 10 min. (Lantern) C. L. Metcalf 



12. Some Myriapods of Put-in-Bay. 10 min Stephen R. Williams 



13. The Chondrocranium of Syngnathus fuscus. 20 min J. E. Kindred 



14. Additions to the Birds of Ohio. 10 min Lynds Jones 



15. Bird Migration Groups. 20 min Lynds Jones 



16. Two Recently Destructive Clover Insects of Western Ohio. 5 min 



T. H. Parks 



17. The Preservation of Native Flora and Fauna. 10 min Herbert Osborn 



18. New Economic Applications for the Mangrove. 8 min. (Lantern) 



H. H. M. Bowman 



19. The Progress of Revegetation in the Katmai District. 15 min. (Lantern) 



Robert F. Griggs 



