430 



SCIENCE. 



[N. S. Vol. XXIII. No. 585. 



' On the Relation between Oxygen in Water and 

 the Longevity of the Typhoid Bacillus.' 



George A. Johnson, William R. Copeland and 

 A. Elliott Kimbeblt: 'The Relative Applicabil- 

 ity of Current Methods for the Determination of 

 Putrescibility in Sewage Effluents.' 



George A. Johnson and A. Elliott Kimbebly : 

 ' A Comparative Review of Current Methods for 

 the Determination of Organic Matter in Sewage.' 



A. Elliott Kimbeely and M. G. Roberts : ' A 

 Method for the Direct Determination of Organic 

 Nitrogen by the Kjeldahl Process.' 



A. Elliott Kimbeely and Harry B. Hommon: 

 ' The Practical Advantages of the Gooch Crucible 

 in the Determination of the Total and Volatile 

 Suspended Matter in Sewage.' 



H. W. Clark : ' The Resistance to Decomposi- 

 tion of Certain Organic Matters in Sewage.' 



Stephen DeM. Gage and George O. Adams: 

 ' The Collection and Preservation of Samples of 

 Sewage for Analysis.' 



Ernest C. Levy : ' A Ready Method for Pre- 

 paring a Silica Turbidity Standard.' 



George C. Whipple and Andrew Mayer, Jr.: 

 ' The Solubility of Calcium Carbonate and Mag- 

 nesium Hydroxide and the Precipitation of These 

 Salts with Lime Water.' 



George C. Whipple and Francis F. Longley: 

 ' Experience with the Use of a Nonbasic Alum in 

 Connection with Mechanical Filtration.' 



H. W. Clark and S. DeM. Gage: 'The Use of 

 Copper Sulphate in Water Filtration.' 



H. W. Clark and Stephen DeM. Gage ; ' On 

 the Bactericidal Action of Copper.' 



Fred B. Forbes and Gilbert H. Pratt: 'Notes 

 in Regard to the Determination of Copper in 

 Water.' 



HiBBEET WiNSLow HiLL: 'A Notable Source 

 of Error in Testing Gaseous Disinfectants.' 



Francis H. Slack : ' Methods of Bacteriolog- 

 ical Examination of Milk.' 



HiBBEET WiNSLOW HiLL : ' Suggestions for 

 Change in the Schedules for Making Broth, 

 Gelatin and Agar, Recommended in the Last Re- 

 port of the Committee on Standard Methods of 

 Water Analysis.' 



HiBBEET WiNSLOW HiLL : ' A Device for Filter- 

 ing Toxins, etc., by the Use of Water Pressure.' 



SOCIETIES AND ACADEMIES. 



THE AMERICAN MATHEMATICAL SOCIETY. 



The one hundred and twenty-seventh regu- 

 lar meeting of the American Mathematical 



Society was held at Columbia University, on 

 Saturday, February 24, 1906. Professor W. 

 F. Osgood, the president of the society, oc- 

 cupied the chair. Thirty members attended 

 the meeting. The council announced the 

 election of the following nineteen persons to 

 membership in the society: Mr. M. J. Babb, 

 University of Pennsylvania; Mr. William 

 Betz, East High School, Kochester, N. Y.; 

 Mr. G. D. Birkhoff, University of Chicago; 

 Mr. W. D. Breuke, Harvard University; Mr. 

 B. E. Carter, Massachusetts Institute of 

 Technology; Dr. H. L. Coar, University of 

 Hlinois; Miss Anna Johnson, Harvard Uni- 

 versity; Mr. W. T). Lambert, U. S. Coast Sur- 

 vey; Mr. W. A. Luby, Central High School, 

 Kansas City, Mo.; President W. J. Milne, 

 New York State Normal College; Professor 

 Eichard Morris, Eutgers College; Mr. W. J. 

 Newlin, Harvard University; Miss E. A. 

 Pesta, Wendell Phillips High School, Chicago, 

 HI.; Dr. H. B. Phillips, University of Cincin- 

 nati ; Mr. A. E. Schweitzer, University of 

 Chicago; Mr. C. G. Simpson, Michigan Col- 

 lege of Mines ; Mr. A. W. Stamper, Columbia 

 University; Mr. F. C. Teuton, Central High 

 School, Kansas City, Mo.; Mr. M. O. Tripp, 

 College of the City of New York. Ten appli- 

 cations for membership were received. 



The following papers were read at the 

 meeting : 



W. H. BussEY: 'On the tactical problem of 

 Steiner.' 



Ida M. Schottenfels : ' On linear fractional 

 transformations of functions of the complex 

 variable u -\- ev, when e- = 0' (preliminary com- 

 munication) . 



C. J. Keyser: 'On the linear complex of circle 

 ranges in a plane.' 



B. B. Wilson : ' Note on integrating factors.' 



Miss R. L. Carstens: 'A set of independent 

 postulates for quaternions.' 



W. B. Ford : ' On the analytic extension of func- 

 tions defined by double power series.' 



Oswald Veblen : ' Remark on a measure of 

 categoricalness.' 



Virgil Snyder : ' Surfaces generated by conies 

 cutting a twisted quartic curve and a line in the 

 plane of the conic' 



Claea E. Smith : ' Development of a function 

 in terms of Bessel's functions (second paper).' 



L. P. EisENHART: 'Surfaces with the same 



