560 



SCIENCE 



[N. S. Vol. XXIX. No. 744 



THE AMEEIOAN CHEMICAL SOCIETX 

 NEW TOEK SECTION 



The sixth regular meeting of the session of 

 1908-9 was held at the Chemists' Club, March 5. 



The following papers were presented: 

 New Aromatic Amino Acids: A. H. Kbopff. 



The paper described the method of formation of 

 a certain new diamino isophthalic acid and a 

 diamino toluic acid and of various derivatives of 

 these acids; also some new derivatives of a nitro- 

 amino isophthalic acid and a diamino benzoic acid. 



Some New Quimazolvnes : R. A. GtOETNEE. 



A brief statement was given of further work in 

 the quinazoline field, including some new an- 

 thranils and the preparation of some amino and 

 carboxylated quinazolines. 



The Determination of Nioiium, in the Presence of 



Tantalum. 



The process given consists in the reduction of 

 niobium by means of zinc and acid and the sub- 

 sequent titration with permanganate. 



On Tetrachlor ether and Dichlorvinylether : Will- 

 iam FOSTEE. 



The paper dealt with an improved method for 

 the preparation of tetrachlorether and a new 

 method for the preparation of dichlorvinylether 

 together with the physical properties of these 

 compoimds; also with the preparation of ethoxy- 

 chloracetylchloride by the action of oxygen on 

 dichlorvinylether with a study of the mechanism 

 of the oxidation. 



The Industrial Manufacture of Anhydrous Chlo- 

 rine and the Phenomena Connected with Chlo- 

 rine Detinning: Elmee A. Speeey. 

 The chlorine process of detinning tin plate scrap 

 was described and illustrated by lantern slides 

 and samples. The more important conditions 

 which have made the process commercially suc- 

 cessful were set forth. These included the prepa- 

 ration of liquid anhydrous chlorine, the use of a 

 special form of apparatus for regulating the tem- 

 perature of the reaction, and an electrolytic 

 method for rendering detinned steel free from 

 iron oxide and tin alloy. The tin tetrachloride 

 resulting from the process was shown and its 

 properties, which required special methods of 

 handling, were considered. 



The following ofiBcers were elected for the ses- 

 sion of 1909-10 : 



Chairman — ^Morris Loeb. 

 Vice-chairman — Charles Baskerville. 

 Secretary-Treasurer — C. M. Joyce. 



Executive Committee — W. D. Home, A. G. Still- 

 well, C. B. Zabriskie and David Wesson. 



0. M. JOTOE, 

 Secretary 



THE AMERICAN MATHEMATICAL SOCIETY 



The one hundred and forty-second regular 

 meeting of the society was held at Columbia 

 University on Saturday, February 27, 1909. 

 The brief program required only a single 

 session. Twenty-four members were in at- 

 tendance. President Maxime Bocher occupied 

 the chair. The council announced the elec- 

 tion- of the following persons to membership 

 in the society: Mr. W. T. Campbell, Boston 

 Latin School; Professor W. A. Garrison, 

 Union College; Mr. D. D. Leib, Johns Hop- 

 kins University; Professor WiUiam Marshall, 

 Purdue University; Mr. J. B. Smith, Eich- 

 mond, Va., High School; Mr. 0. M. Sparrow, 

 Johns Hopkins University. Ten applications 

 for membership were received. 



Professor Bocher tendered his resignation 

 as member of the editorial committee of the 

 Transactions, to take effect August 15, it being 

 his intention to spend the coming academic 

 year abroad. Professor Osgood was appointed 

 to fill the unexpired term. 



The following papers were read at this meet- 

 ing: 



Edward Kasner : " Brachistochrones and tauto- 

 chrones." 



D. C. Gillespie : " On extremal curves which are 

 invariant under a continuous group." 



Virgil Snyder : " Infinite discontinuous groups 

 of birational transformations which leave certain 

 surfaces invariant." 



Professor Bocher presented certain results 

 in extension of his paper " On systems of lin- 

 ear differential equations of the first order," 

 read February 22, 1902, and to be published in 

 an early number of the Transactions. 



The San Francisco section of the society 

 also met on February 27, at Stanford Univer- 

 sity. The Chicago Section meets at the Uni- 

 versity of Chicago, April 9-10. The next 

 meeting of the society wiU be held at Columbia 

 University on April 24. 



F. N. Cole, 

 Secretary 



