CONTENTS. Vll 



Number 299. 



Page 



Art. XXIII. — The Crystal Structures of some Carbonates of 



the Calcite Group; by R. W. Gr. Wyckoff 317 



Art. XXIV. — Entelodonts in the Marsh Collection (con- 

 tinued) ; by E. L. Troxell 361 



Art. XXV.— The Age of the Dakota Flora; by E. W. Berry 387 



Art. XXVI. — An Occurrence of Naumannite in Idaho; by 



E. V. Shannon 390 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — An alleged Allotropic Form of Metallic Lead, A. 

 Thiel : Estimation of small amounts of Iron as Thiocyanate, R. Will- 

 statter, 392. — Glucosane, A. Pictet and P. Castan : New Method for 

 the Determination of Zirconium, M. M. Smith and 0. James : Stability of 

 Sucrose in Acid Vegetable Juices, H. Colin, 393.— Einstein Displace- 

 ment of Solar Lines, L. Grebe and A. Bachem : Practical Physics, R. A. 

 Millikan and H. G. Gale, 394.— Herschel, H. Macpherson : Journal de 

 Physique, 395. 



Geology and Mineralogy— Contributions to a history of American state geolog- 

 ical and natural history surveys, G. P. Merrill, 395. — Handbuch der 

 regionalen Geologie : The American Diceratheres, O.A. Peterson, 396. — 

 Atlas der Krystallf ormen, V. Goldschmidt, 397. — Beitrage zur Krystallo- 

 graphie and Mineralogie, V. Goldschmidt, 398. 



Obituary— J. N. Stockwell : M. A. Gautier, 398. 



