896 



SCIENCE. 



[X. S. Vol. XXI. No. 545. 



use of seaweeds in the manufacture of iodine 

 and soda-ash. Dr. Rusby exhibited specimens 

 of Fucus vesiculosus and an inniamed form, 

 which are used medicinally. 



Dr. Howe spoke of dulse as an article of 

 food and of its occurrence in the markets of 

 New York. 



After further discussion, adjournment fol- 

 lowed. 



L. H. LiGHTHIPE, 



Secretary pro tern. 



THE AMERICAN MATHEMATICAL SOCIETY. 



A REGULAR meeting of the society was held 

 at Columbia University on Saturday, April 

 29. On the preceding Saturday the Chicago 

 section met at the University of Chicago. 

 The two sessions of the New York meeting 

 were attended by thirty-eight members. Presi- 

 dent W. F. Osgood occupied the chair, being 

 relieved by Vice-President E. W. Brown and 

 the secretary. The following new members 

 were admitted: J. H. Grace, Peterhouse, 

 Cambridge, Eng.; H. B. Leonard, University 

 of Chicago; R. B. McClenon, Yale Univer- 

 sity; W. S. Monroe, Columbia, Mo.; J. C. 

 Morehead, Yale University; Henri Poincare, 

 University of Paris; R. G. D. Richardson, 

 Yale University; Miss S. F. Richardson, Vas- 

 sar College; F. R. Sharpe, Cornell University; 

 Miss M. S. Walker, University of Missouri. 

 Six applications for membership were received. 

 The total membership of the society is now 

 490, including 34 life members. 



An appropriation of $100 was made toward 

 binding the rapidly accumulating library 

 material. The catalogue of the library now 

 includes nearly 2,000 volumes, accessions 

 amounting to some 500 volumes per annum. 

 The greater part of the expense of binding is 

 borne by the Columbia University Library, in 

 which the collection is deposited. 



The society has recently issued, through 

 The Macmillan Company, an octavo volume 

 of 175 pages containing the lectures on mathe- 

 matics delivered at the Boston colloquium, 

 September, 1903, by Professors E. B. Van 

 Vleck, H. S. White and F. S. Woods. 



The following papers were read at the April 

 meeting : 



Arthur ScnuLXZE: 'Graphic solution of quad- 

 ratics, cubics and biquadratics.' 



Max Mason: 'On the derivation of the differ- 

 ential equation of the calculus of variations.' 



D. R. CuRTiss : ' Theorems converse to Rie- 

 niann's on linear differential equations.' 



Virginia Ragsdale: 'On the arrangement of 

 the real branches of plane algebraic cur\-es.' 



J. C. Morehead : ' Numbers of the form 2*g -\- 1 

 and Fermat's numbers.' 



E. B. Van Vleck : ' Supplementary note on 

 theorems of pointwise discontinuous functions.' 



James Pierpont: 'Inversion of double infinite 

 integrals.' 



James Pierpont: Multiple integrals (second 

 paper.' 



R. B. McClenon : ' On simple integrals with 

 variable limits.' 



E. O. LovETT : ' On a problem including that 

 of several bodies and admitting of an additional 

 integral.' 



M. B. Porter : ' Concerning Green's theorem 

 and the Cauchy-Riemann differential equations.' 



M. B. Porter : ' Concerning series of analytic 

 functions.' 



J. E. Wright: ' Differential invariants of space.' 



Edward Kasxer : ' On the trajectories produced 

 by central forces.' 



E. B. Wilson: ' Sur le groupe qui laisse invar- 

 iant I'aire gauche.' 



E. J. Wilczynski : ' Projective differential 

 geometry.' 



I. M. Schottenfels : ' On the simple groups of 

 order 8!/2' (preliminary communication). 



I. M. Schottenfels: 'Certain trigonometric 

 formiilas for the quantity x + ey, where r = 0.' 



Edward Kasner : ' A theorem concerning par- 

 tial derivatives of the second order, with applica- 

 tions.' 



J. E. Wright: 'On differential invariants.' 



L. P. Eisenhart: ' Surfaces of constant curva- 

 ture and their transformations.' 



L. E. Dickson : ' On the class of the substitu- 

 tions of various linear groups.' 



JosiAii RoYCE: 'The fundamental relations of 

 logical and geometricitl theory.' 



The summer meeting of the society will 

 be held at Williams College, Williamstown, 

 Mass., on Thursday and Friday, September 

 7-8. The San Francisco section will also 

 meet in September. F. N. Cole, 



Secretary. 



