EDITORIAL 649 
13. Recent Severe Seismic Movements in Nicaragua. By JOHN CRAW- 
FORD, Managua, Nicaragua. 
14. Another Episode in the History of Niagara River. By J. W. SPENCER, 
Washington, D.C. 
15. The Age of Niagara Falls as Indicated by the Erosion at the Mouth 
of the Gorge. By Professor G. FREDERICK WRIGHT, Oberlin, O. 
16. A Kecently Discovered Cave of Celestite Crystals at Put-in-Bay, O. 
By G. FREDERICK WRIGHT. 
17. Geography and Resources of the Siberian Island of Sakhalin. By 
Professor BENJAMIN HowarbD, London, Eng. 
18. Evidence of Recent Great Elevation of New England. By J. W. 
SPENCER, Washington, D. C. 
Ig. The Oldest Paleozoic Fauna. By G. F. MATTHEW, St. John, N. B. 
20. The Oldest Known Rock. By Professor N. H. WINCHELL, Min- 
neapolis, Minn. 
21. The Origin of the Archzan Igneous Rocks. By Professor N. H. 
WINCHELL. 
22. Joints in Rocks. By Professor C. R. VAN HISE, Madison, Wis. 
23. Notes on Some European Museums. By Dr. E. O. Hovey, New 
York, N. Y. 
24. History of the Blue Hills Complex. By Professor W. O. CRosBy, 
Boston, Mass. 
25. Paleontology of the Cambrian Terranes of the Boston Basin. By 
AMADEUS W. GRABAU, Boston, Mass. 
26. Diamonds in Meteorites. By Mrs. E. M. SOUVIELLE, Jacksonville, 
Fla. 
27. The Periodic Variations of Glaciers. By Professor HARRY F. REID, 
Baltimore, Md. 
28. Note on the Occurrence of Tourmalines in Canada. By C. R. 
ORCUTT, San Diego, Cal. 
29. The Agassiz Geological Explorations in the West Indies. By ROBERT 
T. HILL, Washington, D. C. 
BEFORE THE NATIONAL GEOGRAPHIC SOCIETY. 
1. The Venezuela-British-Guiana Boundary Dispute. By Dr. Marcus 
BAKER, Washington, D. C. 
2. Considerations Governing Recent Movements of Population. By JoHN 
HypbeE, Washington, D.C. 
3. Some New Lines of Work in Government Forestry. By GIFFORD 
PincHoT, Washington, D. C. 
4. The Development of the United States. By W J McGEE, Washing- 
ton; D.C. 
