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CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



October 5. Observations on the Geology of Colombia, by Mr. F. M. 



Anderson, Berkeley, California. 



November 2. Bacterial Food Poisoning, by Dr. Ivan C. Hall, Asso- 

 ciate Professor of Bacteriology, University of Cali- 

 fornia. 



December 7. Field Work of the Department of Ornithology and Mam- 

 malogy during 1921, by Mr. Joseph Mailliard, Curator, 

 Department of Ornithology and Mammalogy, Cali- 

 fornia Academy of Sciences, San Francisco. 



The Sunday Afternoon lectures delivered in the Museum 

 Building during 1921 have been well attended; they have 

 included the following: 



January 2. Atoms and Ions, by Dr. E. P. Lewis, Professor of 

 Physics, University of California, Berkeley. 



January 9. Electrons and Positive Rays, by Dr. E. P. Lewis, Pro- 

 fessor of Physics, University of California, Berkeley. 



January 16. Radioactive Transformations, by Dr. E. P. Lewis, Pro- 

 fessor of Physics, University of California, Berkeley. 



January 23. General Properties of X and Gamma Rays, by D. L. 

 Webster, Professor of Physics, Stanford University, 

 California. 



January 30. Photography of the Planets, with Special Reference to 

 Mars, by Dr. E. C. Slipher, Lowell Observatory, Flag- 

 staff, Ariz. 



February 6. X-Ray Spectra, by Dr. D. L. Webster, Professor of 

 Physics, Stanford University, California. 



February 13. The Structure of Atoms, by Dr. D. L. Webster, Pro- 

 fessor of Physics, Stanford University, California. 



February 20. How Uncle Sam's Money is Wasted, by Mr. Edward 

 Berwick, Member of the Institute of International 

 Law, Pacific Grove, Calif. 



February 27. The Dimensions of the Stellar Universe, by Dr. Harlow 

 Shapely, Mount Wilson Observatory, Pasadena, Calif. 



March 6. Eighteen Thousand Miles in Search of Mosquitoes in Cali- 



fornia — How and Why, by Major W. B. Herms, As- 

 sociate Professor of Parasitology, University of Cali- 

 fornia, Berkeley. 



March 13. Parasitism among Insects, by Mr. Harry S. Smith, Ento- 



mologist, State Department of Agriculture, Sacra- 

 mento, Calif. 



March 20. Some Injurious Forest Insects of California, by Dr. E. C. 



Van Dyke, Assistant Professor of Entomology, Uni- 

 versity of California, Berkeley. 



March 27. Evolution of the Ancient Orders of Insects, by Professor 



C. W. Woodworth, Professor of Entomology, Uni- 

 versity of California, Berkeley. 



April 3. The Evolution of California Scenery, by Dr. R. S. Hol- 



way, Associate Professor of Physical Geography, 

 University of California, Berkeley. 



April 10. Ancient Seas and their Faunas, by Dr. B. L. Clark, As- 



sistant Professor of Paleontology, University of Cali- 

 fornia, Berkeley. 



April 24. The Former Mammalian Life of California, by Dr. 



Chester Stock, Research Assistant, Department of 

 Paleontology, University of California, Berkeley. 



