784 



SCIENCE. 



[N. S. Vol. XXIII. No. 594. 



Virgil Snyder : ' On twisted curves contained 

 in a linear complex.' 



G. E. Wahlin ; ' The number of classes of binary 

 quadratic forms and ideals.' 



R. G. D. RiCHAEDSON : ' On the fundamental 

 theorem in the reduction of multiple integrals.' 



James Pibbpont : ' The notion of area of curved 

 surfaces.' 



E. R. Hedrick: 'Functions and their deriva- 

 tives on given assemblages.' 



E. R. Hedrick : 'Lipschitz's condition in the 

 case of implicit functions.' 



Max Mason : ' A necessary condition for an ex- 

 tremum of a double integral.' 



G. A. Bliss : ' An invariant of the calculus of 

 variations corresponding to geodesic curvature.' 



Edward Kasner : ' A generalization of con- 

 formal representation.' 



Edward Kasner : ' Velocity curves in the 

 dynamics of a particle.' 



J. W. Young : ' On a generalization of a prob- 

 lem of Tchebychev.' 



C. J. Keysek: ' Concerning the bond uniting 

 elements into a space.' 



C. N. Haskins : ' Note on the differential in- 

 variants of a plane.' 



E. C. CoLPiTTS : ' On twisted quintic curves.' 



W. C. Breuke : ' On the differentiation of trigo- 

 nometric series.' 



I. C. Rabinovitch : ' The necessary and suffi- 

 cient kinematic axiomS~of geometry.' 



In the interval between the sessions the 

 members lunched together, and the informal 

 dinner in the evening, attended by some thirty 

 members, afforded another welcome oppor- 

 tunity for conference and renewal of ac- 

 quaintance. 



The thirteenth summer meeting and fifth 

 colloquium of the society will be held at Yale 

 University during the entire week, September 

 3-8, 1906. The first two days will be devoted 

 to the regular sessions for the presentation of 

 papers. The colloquium, which will open on 

 Wednesday morning, will include the follow- 

 ing courses of lectures: 



Professor E. H. Mooee : ' On the theory of 

 bilinear functional operators.' 



Professor Max Mason : ' Selected topics in the 

 theory of boundary value problems of differential 

 equations.' 



Pbofessoe E. J. WitczYNSKi: 'Projective dif- 

 ferential geometry.' "W. H. Bussey, 

 Assistant Secretary. 



FOLK-LORE MEETINGS EST CALIFORNIA. 



The seventh meeting of the California 

 Branch of the American FoUs-Lore Society 

 was held in South Hall, University of Cali- 

 fornia, Berkeley, on Tuesday, March 20, 1906, 

 at 8 P.M. Mr. Charles Keeler presided The 

 minutes of the last meeting were read and 

 approved. The following were elected to 

 membership in the society : Dr. E. K. Putnam, 

 Stanford University, and the Department of 

 Education of Ontario, represented by the 

 Honorable David Boyle, Toronto. Professor 

 Vernon L. Kellogg, of Stanford University, 

 gave an address, illustrated vrith lantern slides, 

 on ' In Samoa.' 



The fourth regular meeting of the Berkeley 

 Folk-Lore Club during 1905-6 was held in the 

 Faculty Club of the University of California 

 on Tuesday evening, April 3. President A. 

 F. Lange presided. On motion a committee 

 consisting of Charles Keeler, A. H. Allen and 

 P. E. Goddard was appointed to report on the 

 feasibility of a special investigation of the 

 folk-lore of Berkeley. Dr. P. E. Goddard 

 then presented a paper entitled ' Some Ex- 

 amples of Tolowa Tales,' which was discussed 

 at length. A. L. Kroeber, 



Secretary. 



THE TORRET botanical CLUB. 



The meeting of April 10, 1906, was held at 

 the American Museum of Natural History, 

 with President Rusby presiding. Ten per- 

 sons were present. 



President Eusby, in the absence of the 

 chairman of the field committee, briefly out- 

 lined the program for the spring excursions. 



The scientific program was an illustrated 

 lecture, by Dr. Henry Kraemer, of the Phila- 

 delphia College of Pharmacy, on ' An Experi- 

 ment in the Growing of Wild Plants, and a 

 Plea for the Preservation of Our Native 

 Woodlands.' 



The experiments in the growing of wild 

 plants were carried on in what would usually 

 be considered a very unfavorable situation — 

 namely, a narrow strip of ground about sixty 

 feet long and varying from seventeen to 

 thirty-one inches wide on the northern side of 



