IG TWELFTH REPORT. 



19. Regeneration in the Nerves of Canibarus. H. M. Macrurdv. 



20. A Coutribntion to the Theory of Binuelearity ( hinteru slides), 

 R. W. Hegner. 



21. Tlie Origin and Meaning of the Second Pohir Body. Chas. R. 

 BaiT. 



22. On Two Abnormalities in the Craytish. Lncia Harmon. 



23. The Rotary Power of Extracts of the Bodies of Snails. Elliot R. 

 Downing. 



24. The Formation of Habit at High Speed. O. C. Glaser. 



25. Notes on Some of the Rarer Species of Michigan Birds. Walter 

 B. Barrows. ■ 



26. Methods of Photographing Birds ( lantern slides ) . R. W. Herger. 



27. A Simple Cooling Device for Use with the Microtome. O. C. 

 Glaser. 



28. A Word on Double Embryos. O. C. Glaser. 



29. The Theory of ^limicry (lantern slides). Jacob Reighard. 



30. The University Biological Station at Douglas Lake (lantern 

 slides). Jacob Reighard. 



31. A Further Report on the I'earl Organs in ^linuows (lantern 

 slides). Norman H. Stewart, 



32. The Pearl Organs of American Minnows in their Relation to the 

 Factors of Descent (lantern slides). Jacob Reighard. 



33. Some Methods of Studying Vision in Fishes, with Demonstration 

 of Apparatus. Crystal Thompson and Mary Axt. 



34. A Remedy For the Black Fly Pest in the Southern Peninsula of 

 Michigan. Cora D. Reeves. 



35. Experiments on the Role Played by Odors in Determining the 

 Behavior of Bees. Max Peet. 



36. Variation in the Genus of Snakes, Regina. Chas. W. Obee. 



37. Mimicry in Tabanus Atratus. S. D. Magers. 



38. The Mendeliau Law Demonstrated By the J)omestic Fowls. S. 

 D. Magers, 



39. Another Nectria Associated with Fusarum. ( 10 min. ) J. B, 

 Pollock, 



40. Further Observations on the life History of Puccinia malvace- 

 orum, (15 min.) J. B. Dandeno. 



41. A Wide-spread Error Concerning the Identity of the Cortinarius 

 collinitus. (10 min.) C. H. Kautfman. 



42. Unreported Michigan Fungi for 1909. (5 min.) C. H. Kauffman. 



43. The Distribution of Mushrooms at Negaunee, Mich, (10 min,) 

 Rose M, Taylor, 



44. Placentation in the Liliaceae, (15 min.). C, E, Temple, 



45. Sodium Silicate as a Mounting Medium, (10 min,) J. B. Dandeno. 



46. The Prothallia of the Ostrich Fern in their Relation to the Nitro- 

 gen Supply. (10 min.) Elizabeth D. Wuist, 



47. Some Attemjjts to Distort the Mitotic Figure in the Root-tips by 

 Means of Magnetic Force, (15 min.) Elliott R Downing. 



48. On the Relation of the Impervious Layer to Plant Distribution. 

 (10 min.) Geo. I*. Burns. 



4!>. The Development of Plant-Societies in Drained Glacial Ponds. 

 (20 min.) LeRoy H. Harvey, 



