Mabch 13, 1914] 



SCIENCE 



397 



W. F. Osgood: "Liouville's theorem concerning 

 periodic functions of several variables. ' ' 



L. M. Kells : "A complete characterization of 

 dynamical trajectories in n-space. " 



W. H. Cramblet : "A classification of discon- 

 tinuous functions and some allied problems. ' ' 



J. K. Lamond : ' ' Note on the reduction of 

 multiple i-integrals to iterated i-integrals. ' ' 



L. A. Howland : ' ' Functions of n variables 

 which are functions of r combinations of these 

 Tariables. ' ' 



J. I. Tracey: "Covariant curves of the plane 

 rational quintic. ' ' 



A. B. Coble: "Restricted systems of equa- 

 tions. ' ' 



L. P. Eisenhart: "Tiansformations of surfaces 

 of Voss. ' ' 



H. Galajikian : "A type of non-linear integral 

 equation. ' ' 



T. H. Gronwall: "On systems of linear total 

 diiferential equations. ' ' 



T. H. Gronwall: "Extension of Laurent's 

 theorem to several variables. ' ' 



T. H. Gronwall: "On approximation by trig- 

 onometric sums." 



K. D. Beetle: "Cyclic systems of osculating 

 circles of curves on a surface. ' ' 



G. M. Green: "Canonical systems in projective 

 differential geometry, with special reference to 

 the theory of curved surfaces. ' ' 



J. H. M. Wedderburn: "A type of primitive 

 algebra. ' ' 



F. N. Cole, 

 Secretary 



TBE AMERICAN SOCIETY OF NATUBALISTS 

 The thirty-first annual meeting of the Ameri- 

 can Society of Naturalists was held in the Zoo- 

 logical Laboratory of the University of Pennsyl- 

 vania on December 31, 1913. In affiliation with 

 the society this year were the American Society 

 of Zoologists, the American Association of Anat- 

 omists and the Federation of American So- 

 cieties for Experimental Biology. 



A revised constitution and by-laws was adopted 

 with several important modifications of the old 

 constitution : 



1. The former division of the society into an 

 eastern branch and a central branch was abol- 

 ished. ' ' Sections of the society may be organized 

 in any locality, with the approval of the society 

 in each ease, by ten or more members for the 

 purpose of holding meetings for the presentation 

 of scientific papers. Such sections shall have the 

 right to elect their own officers and associate mem- 

 bers, but associate membership in any section shall 

 not confer membership in the society. 



2. The executive committee is permitted at its 

 discretion to remit for any year the annual assess- 

 ment of one dollar. 



3. The secretary and treasurer are to be elected 

 for terms of three years each. An additional 

 member of the executive committee is to be elected 

 each year to serve for three years. 



4. "A committee of three, consisting of the 

 president, vice-president and secretary, shall ar- 

 range a program for each meeting." 



5. ' ' The records of the society shall be published 

 once every three years, beginning in 1914." 



6. "The society shall reimburse the secretary 

 for traveling and hotel expenses incurred in at- 

 tending the annual meeting. ' ' 



The following were elected to membership in 

 the society: Irving W. Bailey, Harvard Univer- 

 sity; Arthur M. Banta, Carnegie Station for Ex- 

 perimental Evolution; Harley H. Bartlett, Bureau 

 of Plant Industry; Charles T. Brues, Harvard Uni- 

 versity; Philip P. Calvert, University of Pennsyl- 

 vania; Mintin A. Chrysler, University of Maine; 

 B. A. Gortner, Carnegie Station for Experimental 

 Evolution; Milton J. Greenman, Wistar Institute; 

 Robert W. Hegner, University of Michigan; Law- 

 rence J. Henderson, Harvard University; Merkel 

 H. Jacobs, University of Pennsylvania ; G. L. Kite, 

 Henry Phipps Institute ; Ralph S. Lillie, Clark Uni- 

 versity; Clarence E. McClung, University of Penn- 

 sylvania ; J. H. McGregor, Columbia University ; 

 Edward B. Meigs, Wistar Institute; J. Percy 

 Moore, University of Pennsylvania; Alice Robert- 

 son, Wellesley College; Edmund W. Sinnott, Har- 

 vard University; Arlow B. Stout, New York Bo- 

 tanical Garden; P. W. Whiting, Harvard Univer- 

 sity. 



The program of the morning session was as fol- 

 lows: 



"Some Physiological Phases of the Study of 

 Teratological Variations," by J. Arthur Harris. 



' ' Some Physiological Observations Regarding 

 the Genetic Factors for Plumage Patterns," by 

 Raymond Pearl and Alice M. Boring. 



' ' Twin and Triplet Hybrids from Wild Species 

 of CEnothera with Segregation in the First Gen- 

 eration," by George F. Atkinson. 



"The Functions of an Environment," by Law- 

 rence J. Henderson (by invitation). 



"A New Method of Analysis of Fertilization: 

 Results and Theory," by Frank R. Lillie. 



' ' On the Adaptation of Fundulus to Abnormal 

 Salt Solutions," by Jacques Loeb. (Read by 

 title.) 



' ' Sex Recognition and Sexual Selection in Verte- 

 brates," by Jacob E. Reighard. 



