470 



SCIENCE 



[N. S. Vol. XXVI. No. 667 



F. L. Griffin : " Certain trajectories common 

 to different laws of central force." 



E. W. Davis : " Colored imaginaries. I, Imag- 

 inaries in the plane." 



E. W. Davis : " Colored imaginaries. II, Imag- 

 inaries in space.". 



C. H. SiSAM : " On the equations of quartio sur- 

 faces in terms of quadratic forms." 



ViEGiL SNrDEB: "On the range of birational 

 transformation of curves having genus greater 

 than the canonical form." 



G. A. Miller: " Third report on recent progress 

 in the theory of groups of finite order." 



Oswald Veblen : " Continuous increasing func- 

 tions of ordinal numbers." 



H. S. White and Miss K. G. Millee: "Note 

 on Lilroth's type of plane quartie curve." 



W. B. Fite : " Concerning the degree of an irre- 

 ducible linear homogenous group." 



Aethue Ranum : " Concerning linear substitu- 

 tions of finite period -with rational coefficients." 



R. P. Stephens : " Certain curves of class n 

 having n — 2 tangents in any given direction." 



A. L. Van Benschoten : " Curves of genus 4 

 vrhieh remain invariant under birational trans- 

 formation." 



M. E. Sinclair : " On a discontinuous solution 

 in the problem of the surface of revolution of 

 minimum area." 



Maurice Fe£chet: " Sur les operations linS- 

 aires (troisifeme note)." 



A. G. Geeenhill : " The elliptic integral in 

 electromagnetic theory." 



The next meeting of the society will be held 

 at Columbia University on October 26. The 

 San Francisco section met at the University 

 of California on September 30; the South- 

 western Section will meet at Washington 

 University on November 30, and the Chicago 

 section at the University of Chicago on De- 

 cember 30-31. The annual meeting of the 

 society will be held at Columbia University 

 on December 27-28. F. N. Cole, 



Secretary 



SOCIETY FOR EXPERIMENTAL BIOLOGY AND 



MEDICINE 



Twenty-fourth meeting. — Carnegie Institu- 

 tion's Station for Experimental Evolution, 

 Cold Spring Harbor, Long Island, New York. 

 June 22, 1907. President Flexner in the 

 chair. 



Memhej-s present: Atkinson, Beebe, Carrel, 

 Davenport, Donaldson, Ewing, Field, Flexner, 

 Gibson, Gies, Hatcher, Lusk, Meltzer, Meyer, 

 Shaffer, Wallace, Wadsworth. 



Memhers elected: C. H. Bunting, Eufus I. 

 Cole, Charles W. Duval, William W. Ford, 

 Frederick P. Gay, Isaac F. Harris, James W. 

 Jobling, Oskar Klotz, Paul A. Lewis, Thomas 

 B. Osborne, H. T. Eicketts. 



Abstracts of the Communications^ 



Demonstrations of Methods and Results of 



Pedigree-ireeding of Plants and Animals: 



Charles B. Davenport. 



Four series of pedigreed poultry were shovsm 

 to illustrate certain laws of inheritance, as 

 follows : (1) Darwin's case of " reversion," (2) 

 The production of a frizzle-silky race, (3) 

 Particulate inheritance of plumage color, (4) 

 Independence in inheritance of the different 

 characters. 



There were also demonstrations of inherit- 

 ance of characters in canaries, of QJInothera 

 (evening primrose) and its mutants, of 

 branching and branchless sunflowers, of vari- 

 ability of chromosomes in CEnothera and its 

 mutants, and of inheritance of abnormal 

 wing venation in the vinegar fly, Drosophila. 



Further Studies of the Effects of the Exposure 

 of Sperm to X-rays: Charles R. Bardeen. 

 Eggs of Rana pipietis fertilized by sperm 

 exposed to Roentgen rays for one hour all 

 develop abnormally. The abnormalities begin 

 to appear during the gastrulation period. 

 Cases of spina bifida are not uncommon. In 

 a lot of several hundred eggs, nearly all of 

 which were fertilized, only one specimen sur- 

 vived two weeks. This was much stunted in 

 growth and very abnormal in shape. Of 80 

 eggs of the common toad exposed only 15 

 minutes to Roentgen rays only 4 larvas sur- 

 vived one month. Most of the larvas were 

 markedly abnormal in shape. Of the sur- 

 ' The abstracts presented in this account of the 

 proceedings have been greatly condensed from ab- 

 stracts prepared by the authors themselves. The 

 latter abstracts of the communications appear in 

 Number 7 of Volume IV. of the society's proceed- 

 ings, which may be obtained from the Secretary. 



