CONTENTS 



Number 21. 



Page 

 Art. XVII. — The Determination of the Space Group of a 



Cubic-Crystal; by R. W. G. Wtckoff, 175 



Art. XVIII. — The Symmetry and Crystal Structure of Zinc 

 Bromate Hexahydrate, Zn(Br0 3 ) .6H„0; by R. TV G. 

 Wtckoff, : .,. 188 



Art. XIX. — On the Symmetry and Crystal Structure of 

 Sodium Hydrogen Acetate, XaH(C o H 3 2 ) 2 ; by R. W. G. 

 Wtckoff, " 193 



Art. XX.— Cone-in-Cone; by W. A. Tarr, 199 



Art. XXI. — Xotes on the Flora of the Payette Formation; 



by R. W. Chaxey, 214 



Art. XXII. — Xotes on the Structure of the Triassic Rocks 



in Southern Connecticut ; by C. R. Loxgyvell, 223 



Art. XXIII. — Amphisymmetric Crystals; by E. T. Wherry, 237 



Art. XXIV.— A New Trilobite Appendage; by T. H. Clark, 215 



Art. XXV. — Cyprine and Associated Minerals from the Zinc 



Mine at Franklin, X. J. ; by J. V. LEWisandL. H. Bauer, 249 



SCIENTIFIC INTELLIGENCE. 



Miscellaneous Scientific Intelligence. — Stratigraphy of Northwest Greenland, L. 

 Koch, 251. — Revue cleGeologie et des Sciences connexes: First Pan-Pacific 

 Commercial Conference: First Congress of Industrial Chemistry, 252. 



Obituary. — A. G. Bell, 252. 



