250 
Some common misconceptions of evolution.............. RAYMOND C. OSBURN 
PUBLIC LECTURES. 
Disease and disease resistance in plants................-e0ucseeee L. R. JoNEs 
Ether-drift experiments at Mount Wilson, California......... Dayton C. MILLER 
PAPERS. 
1. Some proposed state parks for Ohio. (15 min.)........... J. ERNEST CARMAN 
2. sSesregation-and man (ll Samins) esses oe kien er MAYNARD M. METCALF 
3. American biological stains for microscopical preparations. (10 min.), 
S. I. KoRNHAUSER 
4. Further studies in the cytology of Anisolabis. (10 min.) (Lantern), 
S. I. KORNHAUSER 
5. Notes on tropical photography. (© min:).:.:....:.... WittiAM Ray ALLEN 
6. Some unsolved problems in tidal zone ecology. (By title)..... Z. P. METCALF 
7. Preliminary survey of certain aquatic habitats on the Bass Islands. 
(20 mins) i(vantern) his a ee ee: F. H. KRECKER 
8. Some results from a pure-line isolation culture of Euglena gracilis Klebs. 
(Giiasoahbal tare shay Mees enn Y MELA Re Lea” Lue ree ER Tien hy Daw tah Vee W. J. Kostir 
9. A source of material for study of parasites. (5 min.).. MAYNARD M. METCALF 
05 ‘Specific names for parasitess (Simin): .... a... 2 MayNarD M. METCALF 
11. Studies of the biology of freshwater mussels. (15 min.)...WImLIAM RAy ALLEN 
12. The relationship of the Syngnathidae. (15 min.)........JAMES E. KINDRED 
13. A quarter century of bird migration at Oberlin. (30 min.)..... LYNDs JONES 
14. A case of unhindered growth of the incisor teeth of the woodchuck. 
@Okmnint)eea(Wantern) Meta ener erp ice or STEPHEN R. WILLIAMS 
15. A cicindelid from Lake Bennett, British Columbia. (10 min.)..LYNDs JONEs. 
16. Factors influencing reproduction in the cucumber beetle (Diabrotica 
Witata Habr) pc Olin) ie. aac mee eae tienes ree ae roan ae W. V. BaLDUF 
17. Distribution and control of two important grape insects. (10 min.) 
(@eamterm) hy vei ie Pts oh BAe ee ee eee ge ey ieee D. M. DELONG 
18. A study of the distribution of the leafhoppers of Presque Isle, Pa. (5 min.) 
(leaniternt Gorn be eines ene welt Mass) De ORR TRA ape ON ae Si D. M. DELONG 
19. Emergence of a subimago Mayfly. (5 min.)................ F. H. KRECKER 
20. Some factors which have limited and directed insect evolution. (20 min.), 
CLARENCE H. KENNEDY 
21. Insect parasites and predators in spider’s nests. (5 min.)...... Mary AUTEN 
22. The inter-relation of the Hessian fly (Phytophaga destructor) and one 
Ofitsiparasitess (O)min’) gens tie ot neha ee ers eee TEER ARIKS 
23. Biological significance of the endocrines. (20 min.)........ A. B. PLOWMAN 
24. The effect of formaldehyde on the vitamins of milk. (5 min.), 
A. M. BLEILE and R. J. SEYMouR 
25. Variation in the dandelion and some of its causes. (15 min.)...... P. B. SEARS 
26) -soutoOrest maprlohiher erie basin omit) sse)bsei sce see eee P. B. SEARS 
27. The distribution of flowering plants on the smaller islands of Lake Erie. 
(ICO Estate) ae AM oer aoe aE, RUD ny 8 ag at mk ge de Matcotm E. STICKNEY 
28. The sexual nature of vegetative or dichotomous twins of Arisaema. 
(GUE raat) Bien ea eas Ae een are gc Tao ya  kieer ue aE Dated ha Su cua JoHN H. SCHAFFNER 
29. Influence of length of daylight on sex reversal in hemp. (15 min.), 
JOHN H. SCHAFFNER 
30. Some root and stem rots of cloverin Ohio. (10 min.), SYLVESTER S. HUMPHREY 
31. Mosaic disease of tomato. (10 min.) (Lantern)........ RAYMOND A. DOBBINS 
Gre Idan, anclennoas Oi jollenash, | (llsyscabboe)). os 5¢geneuovdnepwoce E. N. TRANSEAU 
33. Ecological distribution of grasses of North America. (15 min.)..E. L. STOVER 
wel,  AMagy elkeeul viooyel Chi stiGneS, (UGS Saati). gc do noseoncano0un0cebaT L. H. TIFFANY 
SOME Seedling: DlighthslOfContim (Lomnins) manele cei eeiaoeme eee WILMER G. STOVER 
305 he courselof a plantidisease. (@5 min)... ose eee ee WILMER G. STOVER 
37. Extension work in plant pathology with special reference to the control of 
Proceedings of the Ohio Academy of Science 
| Scientific Sessions. 
The complete scientific program of the meeting follows: 
PRESIDENTIAL ADDRESS. . 
comand potato diseases, (20imin.) ivi vevtwees occ ncaw E. E. CLAYTON 
