TAP, LB OF CONTENTS. 
Title page 
Letter of Transmittal 
Table of Contents 
Officers for 1912-1913 
Membership list 
Minutes of the Meetings 
Report of the Treasurer 
Complete list of papers and addresses presented at the Eighteenth Annual Meeting 
of the Michigan Academy of Science 
Papers published in this report:- 
1 . President’s Address — Plant Breeding, William E. Praeger 
2. Report of the Director of the Michigan Geological and Biological Survey- 
concerning the work of the year, R. C. Allen 
2a. Report of the Chief Field Naturalist, A. G. Ruthven 
3. A “Clearing House” for Reports on Fungus Distribution, Ernest A. Bessey. 
4. Demonstrations of Ectotrophic and Endot.rophic Mycorhiza, W. B. Mc- 
Dougal 
5. The Vegetation of the Region in the Vicinity of Douglas Lake, Cheboygan 
County, Michigan, F. C. Gates 
G. Some Considerations Concerning the Place and the Origin of Lava Reser- 
voirs, Wm. H. Hobbs 
7. The Age of the Keweenawan Series, A. C. Lane 
8. Some Interesting Changes in the Optical Properties of Crystals with Tem- 
perature, E. H. Kraus and L. J. Youngs 
9. Additional Notes on the Geology of the Detroit River Area, Thomas Nattress . 
10. Notes on the Geology of the Gallina Quadrangle of New Mexico, E. C. Case. . 
11. Correlation of Lake Agassiz with Glacial Lakes in Great Lakes Basins, 
Frank Leverett 
12. The Origin of Continental Forms, II. Howard B. Baker 
13. Maps of the Old Distributaries of the St. Clair and Detroit Rivers, F. B. 
Taylor 
14. Scientific Management and the Wage Earner, F. T. Carlton 
15. The Status of Workmen’s Compensation Legislation, E. H. Ryder 
16. Results of the Mershon Expedition to the Charity Islands, Lake Huron; 
Amphibians and Reptiles, Crystal Thompson and Helen Thompson .... 
17. Some Bird and Mammal Records for Michigan, N. A. Wood 
18. Directions for Collecting and Preserving Specimens of Reptiles and Am- 
phibians for Museum Purposes, A. G. Ruthven 
19. The Breeding Birds of the Charity Islands, Lake Huron, with Additional 
Notes on the Migrants, N. A. Wood 
20. On the Wisconsin Wood-frog, Helen Thompson 
21. The Status of Rana palustris LeConte in Michigan, Crystal Thompson. . . . 
22. Notes on the Phyllopod Crustacea, A. S. Pearse 
23. Notes on Michigan Crustacea. 2. A New Michigan Asellus, A. S. Pearse. . 
24. A Collection of Mammals from Osceola County, Michigan, Orrin J. Wenzel 
25. The Mouth Reflex of Physa: May it be Substituted for the Salivary Reflex 
of Pawlow in Studies of the Nervous System of Snails? Elizabeth Thomp- 
son 
26. A Few Notes on the Mollusca of the Douglas Lake Region, II. Burlington 
Baker 
27. The Origin of the Germ Cells in tire Toad-fish, Emory Sink 
28. On Certain Relations of the Flora and Vertebrate Fauna of Gratiot County, 
Michigan, with an Appended List of Mammals and Amphibians, H. M. 
MacCurdy 
29. Check-list of Michigan Lepidoptera, I. llhopalocera (Butterflies), W. W. 
Newcomb 
30. On Some Amphibians and Reptiles from the State of Vera Cruz, Mexico A. 
G. Ruthven 
31. The Plant Diseases of Michigan, G. H. Coons 
Report of the Librarian for 1911-1912 
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