CONTENTS. 



Page 

 Art. XII. — Role of Water in Tremolite and Other Minerals; 



by E. T. Allen and J. K. Clement 101 



XIII. — Quantitative Determination of the Radium Emana- 

 tion in the Atmosphere ; by G. C. Ashman 119 



XIV. — Determination of Small Amounts of Barium in Rocks; 



by R. W. Langley 123 



XV. — Heat of Combination of Acidic Oxides with Sodium 

 Oxide and Heat of Oxidation of Chromium ; by W. G. 

 Mixtee 125 



XVI. — Concerning Certain Organic Acids and Acid Anhy- 

 drides as Standards in Alkalimetry and Aciclimetry ; by 

 I. K. Phelps and L. H. Weed _' _.__ 138 



XVII. — Comparison between Succinic Acid, Arsenious Oxide 

 and Silver Chloride as Standards in Iodimetiw, Acidi- 

 nietry and Alkalimetry ; by I. K. Phelps and L. H. 

 Weed _ _ 143 



XVIII.— Orthoclase Twins of Unusual Habit ; by W. E. 



Foed and E. W. Tillotson, Jr 149 



XIX. — Palisade Diabase of New Jersey ; by J. V. Lewis _. 155 



XX. — New Horse from the Lower Miocene; by F. B. 



Loomis _ 163 



SCIENTIFIC INTELLIGENCE. 



Geology — Indisches Perm, und die permische Eiszeit, E. Koken, 165. — Geo- 

 logical Survey of Western Australia, Bulletin 29 : Illinois State Geological 

 Survey : Map of Vesuvius, 166. — Pocket Handbook of Minerals, G. M. 

 Butler, 167. 



Botany — Origin of a Land Flora, F. 0. Bower, 167. — Linnaeus, V. Suringar : 

 Algeuflora der Danziger Bucht ; em Beitrag zur Kenntniss der Ostseeflora, 

 Lakowitz : Text- Book of Botany, 168. 



