860 



SCIENCE. 



[N. S. Vol. XXV. No. 648 



the fundamental region of a discontinuous group 

 of linear transformations.' 



E. B. Wilson: 'Oblique reflections and uni- 

 modular strains.' 



C. N. MooBE : ' On the introduction of con- 

 vergence factors into summable series and sum- 

 mable integrals.' 



The May number (volume 13, number 8) 

 of tbe Bulletin of the American Mathematical 

 Society contains: Report of tbe February 

 meeting of tbe San Francisco Section, by W. 

 A. Manning; Eeport of the Fifty-seventb 

 Meeting of tbe American Association for tbe 

 Advancement of Science, by L. G. Weld ; ' On 

 a Final Form of the Theorem of Uniform 

 Continuity,' by E. R. Hedrick ; ' The Groups 

 Generated by Three Operators Each of which 

 is the Product of the Other Two,' by G. A. 

 Miller; 'A Table of Multiply Perfect Num- 

 bers,' by R. D. Carmichael ; ' The Symmetric 

 Group on Eight Letters and the Senary First 

 Hypoabelian Group,' by L. E. Dickson; 

 * Double Points of Unicursal Curves,' by J. E. 

 Wright ; ' The Mathematical Tablets of 

 Nippur,' by D. E. Smith ; ' Osgood's Theory 

 of Functions ' (Notice of Professor W. F. Os- 

 good's Lehrbuch der Funktionentheorie), by 

 H. S. White; Shorter Notices (Amoux's In- 

 troduction a I'Etude des Fonctions Arith- 

 metiques, by W. H. Bussey; Neumann's 

 Studien iiber die Methoden von C. Neumann 

 und G. Robin zur Losung der beiden Rand- 

 wertaufgaben der Potentialtheorie, by O. D. 

 Kellogg ; Biermann's Vorlesungen iiber mathe- 

 matische Naherungsmethoden, by J. W. 

 Young; Aries's La Statique Chimique Basee 

 6ur les deux Principes Fondamentaux de la 

 Thermodynamique, by E. B. Wilson) ; Notes ; 

 New Publications. 



SOCIETIES AND ACADEMIES 

 THE IOWA ACADEMY OP SCIENCES 



The twenty-first annual session of the Iowa 

 Academy of Science was held at Drake Uni- 

 versity, Des Moines, Iowa, on April 26 and 27. 

 The meeting was well attended and much in- 

 terest was manifested in the papers presented. 

 In addition to the regular program, illustrated 

 lectures were given on the evening of the 

 twenty-sixth by Professor H. L. Russell, of 



tbe University of Wisconsin, on ' Recent Dis- 

 coveries with Reference to Insect-borne Dis- 

 eases,' and by Professor W. W. Campbell, 

 director of the Lick Observatory, on ' The 

 Solar Eclipse in Spain.' 

 The oflScers elected for the ensuing year are : 



President — John L. Tilton, Simpson College. 



First Vice-President — C. L. Von Ende, State 

 University. 



Second Vice-President — Nicholas Knight, Cor- 

 nell College. 



Secretary — L. S. Eoss, Drake University. 



Treasurer — ^H. E. Summers, Iowa State College. 



The following program was presented: 



The Influence of Science in Forming Ideals. 

 President's Address: C. O. Bates. 



Exposures of lowan and Kansan (?) Drift, 

 East of the Usually Accepted Boundary 

 Line of the Driftless Area: Ellison Ore. 



(a) Volcanic Phenomena around Citlaltepetl 

 and Popocatepetl, Mexico; (h) Physio- 

 graphic significance of the Mesa de Maya; 

 (c) Tertiary Terranes of New Mexico: 

 Chakles R. Keyes. 



A Visit to the Panama Canal (illustrated) : 



Grant E. Finch. 



An account of three weeks of observations 

 on the Canal Zone during the summer of 

 1906. Impressions of climatic conditions and 

 of problems and progress in the canal enter- 

 prise. 



(a) The Channel of the Mississippi between 

 Lansing and Dubuque (illustrated) ; (b) 

 The Unconformity at the Base of the Saint 

 Louis Limestone (illustrated) : S. Calvin. 



(a) Recent Alluvial Changes in Southwest 

 Iowa; (b) Effect of Certain Characteristics 

 of Formations upon Bate of Their Erosion : 

 J. E. Todd. 

 (a) The Loess of the Missouri Biver (illus- 

 trated). 



In large part a rejoinder to Professor 

 Todd's late paper on the same subject, especial 

 attention being given to his attempted expla- 

 nation of the manner in which the shells of 

 molluscs found their way into the deposit. 

 (6) The Loess of the Paha (illustrated). 



