1903.] 



SCIENCE. 



411 



The following papers were read at this 



meeting. 



I. J. 8011 WATT: 'On tlip length of curves.' 



T. -T. I'a. Bromwich : ' Similar conies through 



tliree points.' 



D. R. ClRTiss: ' Binary families in a triply eon- 

 iiectcil refrion. with especial reference to hyper- 

 •reometrie families.' 



Joii.N EiESLAND: 'On a certain system of con- 

 jugate lines on a surface transformable into 

 4isymptotic lines by means of Euler's transforma- 

 tion." 



Edward Kasner : ' A class of conformal trans- 

 formations.' 



Edward Kasner : ' Xotes in the theory of sur- 

 faces.' 



E. R. Hedrick: ' Xote on the existence of a con- 

 tinuous first derivative.' 



G. A. Bliss: " .Jacobi's condition in the calculus 

 of variations when both end points are variable.' 



Arnold Emcii: 'Note on the p-discriminant of 

 •ordinary differential equations of the first order.' 



Helen A. Merrill: ' On a notable class of linear 

 ilifferential equations of the second order.' 



Fi.OKiAN Ca.iori: 'On the circle of convergence 

 of the powers of a power series ' ( preliminary 

 communication). 



E. T. Whittaker : ' An expression of certain 

 known functions as generalized hypergeometric 

 functions.' 



\V. H. Yoi-Nc. : ' On a test for non-uniform con- 

 vergence.' 



•I. 1. HrTC'iiiNKON : ' On the automorphic func- 

 tions of signature (0, 3; 2, 6, 6).' 



B. (). Peirce: ' On the lines of certain classes of 

 solenoiilal or lamellar vectors symmetric with re- 

 spect to an a.xis.' 



H. T. Eddy: 'The multiplication of complex 

 nuint)ers and of vectors compared.' 



.T. N. Van der Vries: 'On monoids.' 



Jacob Westlv.nd: 'On the congruence a:*^) = 

 1 nu)d. P".' 



Alfred IvOEWY: ' Zur Gruppentheorie mit 

 Anwendungen auf die Tlieorie der linearen horao- 

 genen Differentialgleichungen.' 



Sai'L Epsteen : ' Semireducible hyperconiplex 

 number systems.' 



I-. E. Dickson: 'On the subgroups of order a 

 power of /) in the quaternary abelian group in the 

 (ialois field of order p".' 



L. E. Dickson : ' The subgroups of order a 

 power of 2 of the simple quinary orthogonal 

 group in the Galois field of order p„ =Sl ±3.' 



1-. E. DicK.soN : ' Determination of all groups of 

 biviuv line;ir sulistitutions with integral coelli- 



cients taken ukmIuIo 3 and of determinant unity.' 



L. E. Dickson : ' Determination of all the sub- 

 groups of the known simple group of order 25920.' 



L. E. Dickson : ' The systems of subgroups of 

 the quaternary abelian group. in a general Galois 

 field.' 



C. N. Haskins: ' On tlie invariants of quadratic 

 dilferential forms.' 



Frank JIorley: 'On projective coordinates." 



Frank Morley : ' On a skew quadrangle co- 

 variant with six points of space' (preliminary 

 communication) . 



E. B. Wilson : ' The projective definition of 

 area.' 



R. S. Woodward: 'On the values of the 

 stretches and the slides in the tlieory of strain.' 



R. S. Woodward: 'The radial compressibility 

 of the earth compatible with the Laplacian law of 

 density distribution.' 



E. 0. IjOVETT: 'Periodic solutions of the prob- 

 lem of four bodies.' 



E. O. Lovett: 'Central conservative systems 

 with prescribed trajectories.' 



S. E. Slocum: 'Rational formulas for the 

 strength of concrete-steel beams.' 



A. S. CliESSi.v: ' On a class of linear differential 

 equations.' 



<'. M. Mason: 'On certain systems of differ- 

 ential equations: generalization of Green's func- 

 tions, analytic character of the solutions.' 



E. V. Huntington : ' A set of independent pos- 

 tulates for the algebra of logic' 



Pleasant social features of the meeting were 

 the reception tendered to the society by Pro- 

 fessor and Mrs. Pickering, at the Harvard Col- 

 lege Observatory, where the rich collection of 

 stellar photographs was visited under Pro- 

 fessor Pickering's guidance; several informal 

 and well-attended dinners and evening gather- 

 ings; and on Thursday afternoon an excur- 

 sion to Nantasket in Boston harbor. 



The next meeting of the society will be held 

 at Columbia University, on Saturday, Oc- 

 tober 31. F. N. Cole, 



Secretary. 



ui-scussioy AXD coRKESPoyoEycf:. 



TOXIC EFFECT OF ACIDS OK SEEDLINGS. 



Ix a recent number of Science (Vol. 

 XVIII...^ 4.->:5, September 4, 1903) there is a >^ *-' 

 communication describing the effect of solu- 

 tions of certain bases and acids upon seedlings 



