342 



SCIENCE 



[N. S. Vol. XXV. No. 635 



Geometry,' by E. J. Wilczynski ; ' On Loci the 

 Coordinates of whose Points are Abelian 

 Functions of Three Parameters,' by J. I. 

 Hutchinson ; ' Associated Configurations of 

 the Cayley- Veronese Class,' by W. B. Carver; 

 'Von Helmholtz,' by E. B. Wilson; ' Pier- 

 pont's Theory of Functions ' (Review of Pier- 

 pont's Theory of Functions of Real Variables, 

 Volume I.), by G. A. Bliss; 'The Mathe- 

 matical Tripos for 1906,' by Virgil Snyder; 

 Shorter Notices : Simon's Ueber die Entwick- 

 lung der Elementar-Geometrie im XIX. Jahr- 

 hundert and Simon's Methodik der Elemen- 

 taren Arithmetik in Verbindung mit Alge- 

 braischer Analysis, by D. E. Smith; Randall's 

 Elements of Descriptive Geometry and Ferris's 

 Elements of Descriptive Geometry, by L. I. 

 Hewes; 'Notes'; 'New Publications.' 



The January number contains : Report of 

 the October Meeting of the American Mathe- 

 matical Society, by F. N. Cole; Report of the 

 Stuttgart Meeting of the Deutsche Mathe- 

 matiker-Vereinigung, by A. B. Frizell ; ' A 

 New Approximate Construction for nr' by 

 George Peirce ; ' Note on Conjugate Poten- 

 tials,' by 0. D. Kellogg ; ' Groups of Order p'^ 

 Containing Exactly p + 1 Abelian Subgroups 

 of Order p™-i,' by G. A. Miller; 'Note on 

 Systems of In- and Circumscribed Polygons,' 

 by Miss S. F. Richardson ; ' Hermite's Works ' 

 (Review of Picard's Oeuvres de Charles Her- 

 mite. Volume I.) by James Pierpont; 'Pro- 

 jective Differential Geometry ' (Review of 

 Wilczynski's Projective Differential Geometry 

 of Curves and Ruled Surfaces), by Virgil 

 Snyder; Shorter Notices: Nielsen's Hand- 

 buch der Theorie der Cylinderfunktionen, by 

 r. H. Safford; Mach's Space and Geometry 

 in the Light of Physiological, Psychological 

 and Physical Inquiry, by C. J. Keyser; 

 ' Notes ' ; ' New Publications.' 



The February number contains: Report of 

 the Preliminary Meeting of the Southwestern 

 Section, by A. S. Chessin ; ' Selected Topics 

 in the Theory of Boundary Value Problems of 

 Differential Equations,' by Max Mason; 

 ' Note on Fourier's Constants,' by E. H. 

 Moore ; ' On the Minimum Number of Opera- 

 tors Whose Orders Exceed Two in any Finite 



Group,' by G. A. Miller ; ' Note on the Orien- 

 tation of a Secant,' by L. D. Ames ; ' On 

 Euler's (^-Function,' by R. D. Carmichael; 

 Shorter Notices: Muir's Theory of Deter- 

 minants, Revised Edition, by G. A. Miller; 

 Schmall's First Course in Analytical Geom- 

 etry, by Miss E. B. Cowley; Hefter and 

 Koehler's I«hrbuch der analytischen Geome- 

 tric, by Miss E. B. Cowley; Teixeira's Tratado 

 de las Curvas Especiales Notables, by C. H. 

 Sisam; The Scientific Papers of J. Willard 

 Gibbs, by E. B. Wilson; Gerland's Leibnizens 

 Naehgelassene Schriften physikalischen, me- 

 chanischen und teehnischen Inhalts, by 

 Florian Cajori ; ' Notes ' ; ' New Publications.' 



SOCIETIES AND ACADEMIES 



THE AMERICAN CHEMICAL SOCIETY. NEW YORK 

 SECTION 



The fourth regular meeting of the session 

 of 1906-Y was held at the Chemists' Club, 108 

 West 55th Street, on February 8. 



The following papers were presented: 

 The Alkylation of J/.-Quinazolones : M. T. 

 BoGERT and H. A. Seil. 



The Synthesis of NapMhoietrazines from p. 

 Diamine Terephihalic Compounds: J. M. 

 Nelson and M. T. Bogerx. 



Note on the Use of Ultra-violet Light in Con- 

 centrating Willemite: G. C. Stone. 

 Ultra-violet light is used during the concen- 

 tration of Willemite to determine when the 

 tailings are free from the ore, the degree of 

 fluorescence giving a good indication of the 

 amount of ore present in the sample under 

 examination. This method of analysis was 

 illustrated on the lecture table by subjecting 

 samples of Willemite which had been more or 

 less completely extracted to the action of light 

 rich in ultra-violet rays. Of the several 

 samples of tailings examined, some showed no 

 signs of fluorescence, while others showed the 

 presence of sufficient ore to make it worth 

 while to rework them. 



The Determination of Sulphurous Acid in 

 Gelatin: A Manufacturer's Position with 

 Regard to the Pure Food Act: Jerome 

 Alexander. 



