718 



SCIENCE. 



[N. S. Vol. VII. No. 177. 



the Keewatin territory. The relations are il- 

 lustrated by maps. ' The TJse of Local Names 

 in Geology,' C. E. Keyes. The paper is in the 

 main a justification of the recent introduction 

 and spread of local formational names. ' The 

 Weathered Zone (Sangamon) between the lowan 

 Loess and Illinoian Till Sheet,' Frank Leverett. 

 After an introduction describing the general 

 relationships of the subdivisions of the glacial 

 deposits concerned, the character, distribution 

 and interpretation of the zone of weathered 

 materials, called the Sangamon, are taken up. 

 ' Studies in the Driftless Region of Wisconsin, 

 II,' G. H. Squire. Several small areas are 

 described in detail with sketches, and their 

 topographical forms and superficial deposits 

 are interpreted. ' Fucoids or Coprolites,' J. 



A. Udden. Fossils closely resembling the 

 Spirophyton, of New York, are found in the 

 Middle Devonian along the Mississippi River 

 in Illinois and Iowa. Instead of fucoids, they 

 are interpreted as coprolites from some mud- 

 eating animals, such as sea-cucumbers. 'Zirke- 

 lite a Question of Priority,' M. E. Wadsworth. 

 The author introduces, as in other current jour- 

 nals, his claims to priority in the use of the 

 name zirkelite. Significant comments are added 

 by one of the editors of the Journal of Geology. 

 Editorials and reviews close the number. 



The March number of the Bulletin of the 

 American Mathematical Society contains the 

 following papers : 'The Relations of Analysis 

 and Mathematical Physics,' by Professor H. 

 Poincare, translated hy Mr. C. J. Keyser ; ' The 

 Roots of Polynomials which Satisfy Certain 

 Linear Difierential Equations of the Second 

 Order,' by Professor Masime Bocher ; 'In- 

 flexional Lines, Triplets and Triangles Asso- 

 ciated with the Plane Cubic Curve,' by Profes- 

 sor Henry S. White ; ' On the Intersections of 

 Plane Curves,' by Professor Charlotte Angas 

 Scott; 'Euler's Use of i to Represent an Im- 

 aginary,' by Professor W. W. Beman ; 'Note 

 on the Roots of Bessel's Functions,' by Dr. M. 



B. Porter; 'Shorter Notices;' 'Notes;' and 

 'New Publications.' 



The April Bulletin contains an account of the 

 February Meeting of the Society, by the Secre- 

 tary ; ' The Theorems of Oscillation of Sturm 

 and Klein (First Paper),' by Professor Maxime 



Bocher ; ' Some Examples of Differential In- 

 variants,' by Mr. Charles L. Bouton ; ' On an 

 Extension of Sylow's Theorem,' by Dr. G. A. 

 Miller ; ' Note on the Tetrahedroid,' by Dr. J. 

 I. Hutchinson ; ' Note on Integrating Factors,' 

 by Mr. Paul Saurel ; ' Early History of Galois'' 

 Theory of Equations,' by Professor James Pier- 

 pont ; 'Love's Theoretical Mechanics,' by Mr. 

 W. H. Macaulay ; ' Schell's Tortuous Curves,' 

 by Professor Alexander Ziwet ; 'Page's Differ- 

 ential Equations,' by Professor Edgar OdelL 

 Lovett ; ' Shorter Notices ;' ' Notes ;' and 

 ' New Publications.' 



SOCIETIES AND ACADE3IIE8. 



AMERICAN MATHEMATICAL SOCIETY. 



A REGULAR meeting of the American Mathe- 

 matical Society was held at Columbia Univer- 

 sity, New York City, on Saturday, April SOth. 

 As has now become the rule, the meeting ex- 

 tended through a morning and an afternoon 

 session. In the interval a pleasant opportunity 

 is offered to those present to lunch together in 

 the restaurant on the grounds of the University. 

 Thirty persons were in attendance, and thirteen 

 papers were read, both numbers much exceed- 

 ing the record of the same season in previous 

 years. At the meeting of the Council seven 

 persons were elected to membership in the So- 

 ciety, and four applications for membership were 

 received. The By-Laws of the Society were 

 amended to provide for life membership, the 

 dues being fixed at $50, exclusive of initiation 

 fee. 



The following is a list of the papers pre- 

 sented : 



Morning Session. 



1. Professor W. F. Osgood : ' Example of 

 a single-valued function with natural boundary, 

 whose inverse is also single-valued.' 



2. Mr. J. K. Whittemore : ' A proof of the 

 theorem : 



3!f (a;, y) _ Sy (». 2/) > 



dxdy 



'dy'dx 



3. Mr. H. E. Hawkes : ' The limitations of 

 Greek arithmetic' 



4. Professor H. S. White : ' The construe- 



