Twenty-eighth Annual Meeting 85 
SCIENTIFIC SESSIONS 
The complete scientific program of the meeting follows: 
Presidential Address 
““The Origin of the Cerebral Ganglia of the Vertebrates, ”’ 
F. L. LANDACRE 
Symposium on Science and the War 
The Work of the Ground Schools in the Training of the Air Forces of the 
(Unita SHARES cholic acetal ea NON RC RCAC ch RE och, See Sr F. C. BLAKE 
Modern Methods of Plant Disease Controlzac..................0.. W. G. STOVER 
Pee cried) Pests tm be Arimiys, 2S. Oeste e ee elb eee svete ee GEORGE F. Arps 
Methods of Teaching the Theory of Flight in Schools of Aeronautics. .H. C. Lorp 
Topography and the War on the Western Front...................... T. M. HILts 
The Newer Demands on Physics and Physics Teachers Due to the War.... 
Pe a re eet es i eaioce ds ace tee heme deste duess pai 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............ CuHAs. P. Fox 
38. 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. 20min............ 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. METCALF 
See hesisnvozGanGizzards sO MIN: 2... cic. wea wn cass en RAYMOND C. OsBURN 
10. Free-swimming Larval Colonies of Pectinatella from Black Channel, 
GCHAR GING mrOMMIM: 42am sa2 fare gc.se6% ss ences vow STEPHEN R. WILLIAMS 
11. Anatomy of Echinorhynchus 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. 
ULB NBREEEEOY) a ridibig cole the co RED Ot ses poe I emt ee eo eee R. A. BUDINGTON 
13. Our Knowledge of Ohio Crustacea. 5 min........... RAYMOND C. OSBURN 
14. A List of Ohio Spiders (now in press). 5min............... W. M. Barrows 
15. A Preliminary Survey of the Protozoa of Mirror Lake on the Ohio State 
Uimivensiive Campuses ORIN i. - See else wc t os hee nee MABEL E. STEHLE 
16. Application of Colloid Chemistry to Nephritis. 15 min..HAzEL C. CAMERON 
17. Reaction Time in the Blind and the Deaf. 5min............../ A.M. BLEILE 
18. The Effect of Radium Radiations on the Germ Cells of Drosophila 
AMPClOpuilase a0 TIT Mee . ihc Geel ce sso enidrokeaeeek W. M. Barrows 
19. Studies of Vaso-motor Balance. 15 min. 
CLYDE Brooks, CLAYTON McPEEK and R. J. SEYMouR 
MipEe Le iiMOCOCCHS may peSumORMmita mess < ..c.0 casas ses le os aoe ae CARL L. SPOHR 
eee bhe Cancer Problem. 20 °miny (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 
Piwedkhe Wecidaeces: of Ohio. 15 min, (Lantern)...........0...... 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 
