December 24, 1000 J 



SCIENCE 



935 



whether they would develop into normal 

 plutei. 



The eggs were first centrifuged and then 

 fertilized. About one minute after fertiliza- 

 tion the memhrane was shaken off and the 

 eggs transferred to calcium-free sea-water 

 (Herbst's formula). They were allowed to 

 segment in the calcium-free sea-water and 

 some of the eggs in which the first cleavage 

 plane was parallel to the stratification were 

 isolated. After the blastomeres had fallen 

 apart, they were transferred to normal sea- 

 water where they were permitted to develop. 

 The two blastomeres thus produced differ in 

 that one contains all the red pigment while 

 the other one is perfectly clear and contains 

 the whole of the oil cap. The exact distribu- 

 tion of the two middle layers is not easily 

 made out. Both blastomeres produce normal 

 plutei. The only visible difference in the two 

 was that one contained the red pigment-spots; 

 the other lacked them. Fernaxdus Payne 



IXDIANA UNIVEBSITT 



THE CONVOCATION WEEK MEETINGS OF 

 SCIENTIFIC SOCIETIES 



The American Association for the Advance- 

 ment of Science and the national scientific 

 societies named below will meet at Boston, 

 Mass., during convocation week, beginning on 

 December 27, 1909. 



American Association for the Advancement of 

 Science. — ^Retiring president. Professor T. C. 

 Chamberlin, University of Chicago; president. Dr. 

 David Starr Jordan, of Stanford University; per- 

 manent secretary, Dr. L. 0. Howard, Cosines Club. 

 Washington, D. C. ; general secretary, Professor 

 Dayton C. Miller, Case School of Applied Science, 

 Cleveland, Ohio. 



Local Executive Committee. — H. W. Tyler, 

 chairman; Thomas Barbour, J. S. Kingsley, Ed- 

 ward R. Warren, John Warren, George W. Swett, 

 secretary. 



Section A, Mathematics and Astronomy. — ^Vice- 

 president, Professor Ernest W. Brown, Yale Uni- 

 versity; secretary, Professor G. A. Miller, Uni- 

 versity of Illinois, Urbana, Illinois. 



Section B, Physics. — Vice-president, Dr. Louis 

 A. B.iuer, Carnegie Institution, Washington, D. 

 C. ; secretary. Professor A. D. Cole, Vassar Col- 

 lege, Poughkeepsie, N. Y. 



Section C, Chemistry. — Vice-president, Pro- 

 fessor William McPlierson, Ohio State University; 

 secretary, C. H. Herty, University of North Caro- 

 lina, Chapel Hill, N. C. 



Section D, Mechanical Science and Engineering. 

 — Vice-president, Professor John F. Hayford, 

 Northwestern University; secretary, G. W. Bis- 

 sell, Michigan Agricultural College, East Lansing, 

 Mich. 



Section E, (leology and Geography. — Vice-presi- 

 dent, Reginald W. Brock, Canadian Geological 

 Survey; secretary, F. P. Gulliver, Norwich, Conn. 

 Section F, Zoology. — Vice-president, Professor 

 William E. Ritter, La Jolla, Cal.; secretary. Pro- 

 fessor Morris A. Bigelow, Columbia University, 

 New York City. 



Section G, Botany. — Vice-president, Professor 

 David Penhallow, McGill University; secretary. 

 Professor II. C. Cowles, University of Chicago, 

 Chicago, 111. 



Section B, Anthropology. — Vice-president, Dr. 

 W. H. Holmes, Bureau of American Ethnology; 

 secretary. Dr. George Grant MacCurdy, Yale Uni- 

 versity, New Haven, Conn. 



Section I, Social and Economic Science. — Vice- 

 president, Byron W. Holt, .54 Broad St., New 

 York City; secretary. Dr. John Franklin Crowell, 

 44 Broad St., New York City. 



Section K, Physiology and Experimental Medi- 

 cine. — Vice-president, Professor C. S. Minot, Har- 

 vard Medical School; secretary. Dr. Wm. J. Gies, 

 College of Physicians and Surgeons, Columbia 

 University, New York City. 



Section L, Education. — Vice-president, Dean 

 James E. Russell, Columbia University; secre- 

 tary, Professor C. R. Mann, University of Chi- 

 cago, Cliicago, 111. 



The American Society of Naturalists. — Decern 

 ber 29. President, Professor T. H. Morgan, Co 

 lumbia University; secretary, Dr. H. McE 

 Knower, University of Toronto, Toronto, Can 

 Central Branch. President, Professor R. A 

 Harper, University of Wisconsin; secretary. Pro 

 fessor Thomas G. Lee, University of Minnesota 

 Minneapolis, Minn. 



The American Mathematical Society. — ^Decem 

 ber 28-.30. President, Professor Maxime BOcher, 

 Harvard University; secretary, Professor F. N 

 Cole, .501 West 116th St., New York City. 



American Federation of Teachers of the Mathe- 

 matical and Natural Sciences. — December 27, 28 

 President, Professor H. W. Tyler, Massachusetts 

 Institute of Technology; secretary. Professor C. 



