VI CONTENTS. 



Number 118. 



Page 

 Art. XXVIII. — Ultimate Disintegration Products of the 



Radio-active Elements ; by B. B. Boltwood 253 



XXIX. — Use of the Rotating Cathode for the Estimation 



of Cadmium taken as the Sulphate ; by C. P. Flora . . 268 



XXX. — Crystallization of Luzonite ; and other Crystallo- 



graphic Studies ; by A. J. Moses 277 



XXXI. — Determining of the Optical Character of Birefract- 



ing Minerals ; by F. E. Wright _ 285 



XXXII. — Groups of Efficient Nuclei in Dust-Free Air ; by 



C. Barus 297 



XXXIII. — Studies in the Cyperacese ; by T. Holm___ 301 



XXXIV. — Preliminary Note on some Overthrust Faults in 



Central New York; by P. F. Schneider _. 308 



XXXV. — Petrography of the Tucson Mountains, Pima Co., 



Arizona; by F. N. Guild. (With Plate IX.) 313 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Gases produced by Actinium, Debierne : New 

 Heavy Solution, Duboin, 319.— Hydrolysis of very Concentrated Ferric 

 Sulphate Solutions, Eecoura : Separation of Gold from the Metals of the 

 Platinum Group, Jannasch and von Moyer : Determination of Sugar with 

 Fehling's Solution, Lavalle, 320.— Slow Transformation Products of 

 Eadium, E. Rutherford, 321. 



Geology and Mineralogy — Indiana, Department of Geology and Natural 

 Resources, Twenty-ninth Annual Report, W. S. Blatchley, 322. — Geo- 

 logical Survey of Louisiana : Geological Survey of New Jersey : Brief 

 descriptions of some recently described Minerals, 323. 



