VI CONTENTS. 



Number 250. 



Page 



Art. XXXII.— The Geologic Role of Phosphorus; by E. 



Blackweldee 285 



XXXIII. — Notes on Radiolarian Cherts in Oregon; by W. 



D. Smith 299 



XXXIV.— On the Rates of Solution of Metals in Ferric , 

 Salts and in Chromic Acid; by R. 6. Van Name and 

 D. IT. Hill .301 



XXXV. — Sulphatic Cancrinite from Colorado; by E. S. 



Larsen and G. Steiger 332 



XXXVI. — An Early Pliocene One-Toed Horse, Pliohippus 



lullianus, sp. nov.; by E. L. Troxell 335 



XXXVII. — The Igneous Geology of Carrizo Mountain, 



Arizona; by W. B. Emery 349 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Fluorine in the Animal and Vegetable Kingdoms, 

 A. Gautier and P. Clausmann: Qualitative Separation of the Common 

 Metals whose Sulphides are Insoluble in Dilute Acids. M. J. Clarens, 

 364. — Estimation of Vanadic Acid after Reduction by Metallic Silver, G. 

 Edgar: Density of Radio-Lead from Pure Norwegian Cleveite, T. W. 

 Richards and C. Wadsworth, 3d, 365. — Theory of the Lead Accumulator, 

 C. Fery, 366. — An Active Modification of Nitrogen, 368. — Emission of 

 Electricity from Hot Bodies, O. W. Richardson, 369. 



Geology— La, Flora Liasica de la Mixteca Alta, G. R. Wieland, 370. — Isos- 

 tasy in the Light of the Planetesimal Theory, T. C. Chamberlin, 371. — 

 Relations between the Cambrian and Pre-Cambrian formations in the 

 vicinity of Helena, Montana, C. D. Walcott, 372. 



Obituary — C. S. Prosser: J. Royce: G. Schwalbe: K. Schwarzschild: 

 Prince Boris Galitzin, 372. 



