TES-VOLUME INDEX. 



The INDEX to volumes XXXI-XL, 1911-1915. will be ready for distribu- 

 tion about Jau. 1, 1916. Sent only when specially ordered and on receipt of 

 the price. ONE DOLLAR. Orders should be given without delay as the 

 edition is limited. 



C K T E N T S . 



Page 



Art. I. — A Geologic Reconnaissance of the Cuzco Valley, 



Peru ; by H. E. Gregory (With Plates I and IP) .... 1 



II. — An Aehromatoscope ; by S. R. Williams .. .101 



III. — The Life of Radium; by Ellex Gleditsch _ 112 



IV. — Some New Mineral Occurrences from the Tintic Dis- 

 trict, Utah; by A. H. Means 125 



V. — The Present Status of the Investigation of the Origin 



of Barrier Coral Reefs; by T. W. Vaughax.. 131 



VI. — Relations of Coral Reefs to Crust Movements in the 



Fiji Islands; by E. C. Andrews 135 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Separation of Yttrium from the Yttrium Earths. 

 J. B. Boxardi and C. James: Volumetric Method for Potassium, G. Ajox, 

 1.42. — Potash from Feldspar, 143. — Introduction to Chemical Analyses. 

 E. W, Eockwood: Laboratory Manual arranged to accompany " A Course 

 in Chemistry," W. McPhersox and W. E. Hexdersox: Fluorescence and 

 Resonance of Sodium Vapor, E. J. Strett, 144. — ,3-Eays from Radium D, 

 L. Meitner, 145. — Introduction to Magnetism and Electricity, E. W. E. 

 Kempson: Introduction to the Mechanics of Fluids, E. H. Bartox, 149. 



Geology and Natural History — Triassic Life of the Connecticut Valley, R. S. 

 Lull, 147. — Central Connecticut in the Geologic Past, J. Barrell : 

 Bibliographic Index of American Ordovician and Silurian Fossils, R. S. 

 Bassler. 148. — Fifth Annual Report of the Director of the Bureau of 

 Mines: Determinative Mineralogy, J. V. Lewis, 149. — Monograph of the 

 Existing Crinoids, A. H. Clark : Practical Zoology, R. W. Hegner: 

 Course in Invertebrate Zoology, H. S. Pratt, 150. — Meaning of Evolution, 

 S. C. Schmucker: Lessons in Elementary Physiology, T. H. Huxley : 

 Diversions of a Naturalist, E. Lankester: Beekeeping, E. F. Phillips, 

 151. 



Obituary— A. W. Wright: 0. A. Derby: C. F. Holder: H. E. Eoscoe : H. 

 C. Bastiax: C. J. Bouchard: E. Asshetox: A. Rucker: G. Vasseur, 152. 



