CONTENTS. 



I Page 



; Art. I. — Relation of Isostasy to Uplift and Subsidence ; by 



I W. Bowie 1 



I Art. II. — New Amynodonts in the Marsh Collection ; by E. L. 



' Troxell 21 



Art. III. — New Species of Hj^racodon ; b}^ E. L. Troxell . . 34 



Art. IV. — CiTenopus, the Ancestral Rhinoceros ; by E. L. 



Troxell ". 4L 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — A Recalculation of the Atomic Weights, F. W. 

 Clarke, 51, — The Fundamental Processes of Dye Chemistry, H. E. 

 \ Fierz-David: Organic Chemistry for the Laboratory, W. A. Notes : Quali- 



; tative Chemical Analysis^, M. C. Sneed, 52. — Factory Chemistry, W. H. 



I Hawkes, 53. — Neon Lamps for Stroboscopic Work, F. W. Ashton, 54. — 



j Harmonics in the Siren, E. A. Milne and R. H. Fowler, 55. — An Intro- 



I duction to Technical Electricity, S. G. Starling, 56. 



! 



j Geology. — Thirteenth Annual Report. Florida State Geological Survey, H, 

 I GuNTER, 56. — The Fossil Crinoid Genus Dolatocrinus and its Allies, F. 



Springer: A Contribution to the Description of the Fauna of the Trenton 

 Group, P.E.Raymond: The Genesee Conodonts, with Descriptions of New 

 Species, W. L. Bryant: The Trigoni<e from the Pacific Coast of North 

 America, F. L. Packard, 57. — Iowa Geological Survey, Annual Report, 

 1916: Ninth Biennial Report of the Commissioners of the Connecticut 

 Geological Survey. H. E Gregory: The Tin Resources of the British 

 Enipire, N. M. Penzer, 58. 



Miscellaneous Scientific Intelligence —Hynihiosif^, A Socio-Physiological Study 

 of Evolution, H. Reinheimer: Die Mneme als erhaltendes Prinzip im 

 Wechsel des organischen Geschehens, R. Semon: Bibliotheca Chemica- 

 Mathematica, 59. — Bibliotheca Zoologica II, O. Taschenberg: Annual 

 Report of the Field Museum of Natural History for the year 1920, D. C. 

 Davies, 60. 



Obituary.— E. B. Rosa, 60. 



