REPORT OP NATIONAL MUSEUM, 1925 11 



9. How Trees Grow : Dr. D. T. MacDougall, Desert Botanical Laboratory, 

 Carnegie Institution, Tucson, Ariz., in connection witli the meeting of the 

 American Association for the Advancement of Science, December 30, 1924. 



10. Why the Earth is a Magnet: Prof. W. F. G. Swann, Yale University, in 



connection with the meeting of the American Association for the Ad- 

 vancement of Science, December 31, 1924. 



11. Tree Rings and Climate : Dr. A. E. Douglass, University of Arizona, in 



connection with the meeting of the American Association for the Advance- 

 ment of Science, January 3, 1925. 



12. The Sun and the Weather: Dr. Charles G. Abbot, Assistant Secretary, 



Smithsonian Institution, January 8, 1925. 



13. The Weather : Prof. W. J. Humphreys, Weather Bureau, January 22, 1925. 



14. Mysteries of Bird Migration : Frederick C. Lincoln, Biological Survey ; 



read by Austin H. Clark, January 29, 1925. 



15. The Ocean's Food Resources: Lewis Radcliffe, Deputy Commissioner of 



Fisheries, February 5, 1925. 



16. What Other Peoples Eat : Austin H. Clark, National Museum, February 12, 



1925. 



17. What the Earth is Made of: Dr. Henry S. Washington, Geophysical Labora- 



tory, Carnegie Institution, February 19, 1925. 



18. The Habits of Ants: Dr. William M. Mann, Bureau of Entomology, 



February 26, 1925. 



19. Fish as Food: Lewis Radcliffe, Deputy Commissioner of Fisheries, March 



12, 1925. 



20. How Some Wasps Live : S. A. Rohwer, Bureau of Entomology, March 19, 



1925. 



21. The Work of the Coast and Geodetic Survey in Saving Life and Property 



at Sea : Col. E. Lester Jones, Director, Coast and Geodetic Survey, March 

 26, 1925. 



22. Mosquitoes and Other Blood-sucking Flies: Raymond C. Shannon, Bureau 



of Entomology, April 2, 1925. 



23. Lizards and Their Kin : Miss Doris M. Cochran, National Museum, April 9, 



1925. 



24. Fighting Plant Diseases by Breeding New Plants: Dr. W. A. Taylor, 



Chief, Bureau of Plant Industry, April 16, 1925. 



25. Our Fisheries : Henry O'Malley, Commissioner of Fisheries, April 23, 1925. 



26. The Geodetic Work of the United States Coast and Geodetic Survey : 



Col. E. Lester Jones, Director, Coast and Geodetic Survey, April 30, 1925. 



27. Chiggers, Ticks and Fleas : Dr. H. E. Ewing, Bureau of Entomology, 



May 7, 1925. 



28. Butterflies: Austin H. Clark, National Museum, May 14, 1925. 



Additional radio talks were given by Dr. G. P. Merrill, on the 

 subject of " Meteorites," by C. W. Gilmore on " Fossil Tracks and 

 Trails," and by Dr. Paul Bartsch on "A Plea for Our Native Holly." 



An important series of lectures by Dr. Ales Hrdlicka, Curator of 

 Physical Anthropology, on " Man's Origin," and " Man's Physical 

 and Physiological Characteristics " was given Monday and Friday 

 from October 24 to December 19. The Friday course was technical 

 and was intended primarily for medical, dental and graduate stu- 

 dents, while the Monday lectures were of a more popular nature. 

 Doctor Hrdlicka also addressed the British Association for the 



