CONTENTS. 



Page 



Art. XX. — Development of Fenestella ; by E. R. Cumings. 



(With Plates V, VI, and VII) ;.'.. 169 



XXI. — Age of the Monument Creek Formation ; by N. H. 



Darton , 178 



XXII. — Iodometric Determination of Aluminium in Alumin- 

 ium Chloride and Aluminium Sulphate; by S. E. Moody 3 81 



XXIII. — Secondary Origin of Certain Granites ; by R. A. 



Daly 185 



XXIV. — Tj^chite, a New Mineral from Borax Lake, Califor- 

 nia, and on its Artificial Production and its Relations 

 to Northupite ; by S. L. Penfield and G. S. Jamieson 217 



XXV. — Modification of Victor Meyer's Apparatus for the 

 Determination of Vapor-Densities ; by B. J. Har- 

 rington \ _ 225 



XXVI. — New Lower Tertiary Fauna from Chappaquiddick 

 Island, Martha's Vineyard ; by T. C. Brown. (With 

 Plate VIII) 1 229 



XXVII. — Production of Radium from Uranium ; by B. B. 



Boltwood 239 





SCIENTIFIC INTELLIGENCE. 



Geology — Explorations in Turkestan with an account of The Basin of Eastern 

 Persia and Sistai\. Expedition of 1903, under the direction of Eaphael 

 Pumpelly, 245. 



