SCIENCE 



FRroAY, April 23, 1920 



CONTENTS 

 Platinum and tlie Metals of the Platinum 

 Group : De. George P. Kunz 399 



The American Assodcttion for the Advance- 

 ment of Science: — 

 Sexuality in Mucors: De. Albert F. Blak- 



ESLEE 403 



Scientific Evenis: — 



The Division of States delations of the Na- 

 tional Research Council; Summer Meeting of 

 the American Institute of Chemical Engi- 

 neers; Tlie American Physical Society 409 



Scientific Notes and Neios 410 



University and Educational News 413 



Discussion and Correspondence: — 

 Cerebellar Localisation hy the Application 

 of Strychnine: De. Feedekick E. Miller. 

 A Logic Test: Cheistike Ladd-Feanklin. 

 The Situatian of Scientific Men in Eussia: 

 De. H. Gideon Wells 413 



Quxitations : — 

 Seseareh and the Universities 415 



Scientific SooTcs: — 

 East and Jones on Inbreeding and Out- 

 breeding: Peofessoe Batmond Peakl .... 415 



Special Articles: — 



Correspondence between Chromosome Num- 

 ber and Linkage Groups in Drosophila 

 virilis : Dk. Chas. W; Metz 41 7 



The American Association for the Advance- 

 ment of Science:— 



Section H — Anthropology and Psychology: 

 Propessob Edwaed K. Steong 418 



MSS. intended for 'publication and books, etc., intended for 

 review efaonld be B«&t to The Editor of Science, Garrison-on- 

 BudMD, N. T. 



PLATINUM AND THE METALS OF THE 

 PLATINUM GROUP 



What promises to be the most complete and 

 autlioritative work on platinum and platinvun 

 deposits is about to be published in Geneva, 

 Switzerland. The author, Louis Duparc, is 

 professor of chemistry and i)etrology in the 

 University of Qeneva ; the name of Marguerite 

 'N. Tikonovitch is announced as that of the 

 associate author.^ 



Professor Duparc has long been known as 

 the writer of many papers on the great plati- 

 num deposits of the Ural region in Russia, of 

 which he has made special study. He has also 

 investigated personally the notable platinum 

 deposits in other parts .of the world, and he 

 gives in the present work the ripe results of 

 more than twenty years investigation of the 

 sources of this rare metal. 



The first chapter will be devoted to the to- 

 pography and geological aspects of ihe Ural 

 region. This is followed by a chapter treating 

 of the " mother rocks " of platinum, and by 

 others on the petrography of the primary 

 platiniferous centers, the dunites and perido- 

 tites. Then, in turn, are offered considerations 

 on the pyroxenites and koswites, the rocks of 

 the gabbro family and various vein rocks. The 

 view is then extended to cover the meta- 

 morphosic rocks accompanying the eruptive 

 platiniferous zone. 



Turning then to what more immediately 

 concerns the metal itself, the constituent ele- 

 ments of native platinum are studied, and its 

 state in the different primary deposits, as well 

 as the probable genesis of these deposits. The 

 writer now passes to the analysis and chemical 



1 Louis Duparc and Marguerite N. Tikonovitch, 

 ' ' Platinum and Platinum Deposits, ' ' pub. by " So- 

 ci^te Anonyme des Editions 'Sonor,' " 46 Rue du 

 (Stand, Geneva, Switzerland, 600 pp., 99 text ill., 

 SO stereotype pis., 11 in black and color, 8 of 

 dredges, etc., atlas of Ural deposits, 4°. 



