IV CONTENTS. 



Page 



XII. Crystal Rectifiers for Electric Currents and Electric Oscillations. 



(II.) Carborundum, Molybdenite, Anatase, Brookite. By G. W. 

 Pierce 315 



XIII. On the Magnetic Behavior of Hardened Cast Iron and of Certain 



Tool Steels at High Excitations. By B. O. Peirce . . . 351 



XIV. The Properties of an Aluminium Anode. By H. W. Morse 



and C. L. B. Shuddemagen 365 



XV. A Revision of the Atomic Weight of Chromium. (I.) The Analysis 

 of Silver Chromate. By G. P. Baxter, E. Mueller, and 

 M. A. Hikes 399 



XVI. A Revision of the Atomic Weight of Chromium. (II.) The 

 Analysis of Silver Dichromate. By G. P. Baxter and 

 R. H. Jesse, Jr 419 



XVII. Notes on the Crystallography of Leadhillite. (I.) Leadhillite 

 from Utah; (II.) Leadhillite from Nevada. By Charles 

 Palache and L. La Forge 433 



XVIII. Residual Charges in Dielectrics. By C. L. B. Shuddemagex 465 



XIX. ^4 Photographic Study of Mayer s Floating Magnets. By 



Louis Derr 523 



XX. The Relations of the Norwegian with the English Church, 

 1066-1399, and their Importance to Comparative Literature. 

 By H. G. Leach , 529 



XXI. (I.) Synopsis of the Mexican and Central American Species of 

 Castilleja. By A.Eastwood; (II.) A Revision of the Genus 

 Rumfordia. By B. L. Robinson; (III.) A Synopsis of the 

 American Species of Litsea. By H. H. Bartlett ; (IV.) 

 Some undescribed Species of Mexican Phanerogams. By A. 

 Eastwood ; (V.) Notes on Mexican and Central American 

 Alders. By II. H. Bartlett; (VI.) Diagnoses and Transfers 

 of Tropical American Phanerogams. By B. L. Robinson; 

 (VII.) The Purple-flowered Androcerae of Mexico and the 

 Southern United States. By H. II. Bartlett; (VIII.) 

 Descriptions of Mexican Phanerogams. By H. H. Bartlett 561 



