CONTENTS. 



Nnmlber 153. 



Page 



Art. XXI.— Retardation of "Alpha Rays" by Metal Foils, 



and its Variation with the Speed of the Alpha Particles; 



by T. S. Taylor -.-- 169 



XXII. — Notes on the Lower Paleozoic Rocks of Central 



New Mexico; by W. T. Lee 180 



XXIII. — Kaersutitefrom Linosa and Greenland ; by H. S. 



Washington; with Optical Studies by F. E. Wright.. 187 

 XXIV. — Geology of the Isthmus of Panama ; by E. Howe 212 



SCIENTIFIC INTELLIGENCE. 



Geology — Geology of the Adirondack Magnetic Iron Ores, D. H. Newland : 

 Geologishe Prinzipienfragen, E. Reyee,: Die Entstehung der Kontinente, 

 der Vulkane und Gebirge, P. 0. Koheer, 238. — Geological Survey of 

 Canada, A. P. Low : Geography and Geology of a Portion of Southwestern 

 Wyoming, A. C. Veatch, 239. — Einfuhrung in die Palaontologie, G. Stein- 

 mann: Niagara Stromatoporoids: Occurrence of Hobocystis in Ontario, 240. 



Miscellaneous Scientific Intelligence — Publications of the Japanese Earth- 

 quake Investigation Committee, 240. — The Physical Basis of Civilization, 

 f . W. Heineman: General Physics, H. Crew, 241.— Die Insektenfamilie 

 der Phasmiden, K. B. v. Wattenwyl und J. Redtenbacher, 242. 



SUPPLEMENT. Page 



Art. XXV. — On the Esterification of Malonic Acid ; by I. 



K Phelps and E. W. Tillotson, Jr 243 



XXYI. — Concerning the Purification of Esters ; by I. K. 



and M. A. Phelps and E. A. Eddy 253 



XXVII. — On the Conversion of Cyanacetic Ester to Malonic 



Ester ; by I. K. Phelps and E. W. Tillotson, Jr. __. 257 



XXVIII. — Researches on the Influence of Catalytic Agents 

 in Ester Formation. On the Esterification of Cyana- 

 cetic Acid ; b}^ I. K. Phelps and E. W. Tillotson, Jr. 264 



XXIX.— On the Preparation of Malonic Acid or its Ester 

 from Monochloracetic Acid ; by I. K. Phelps and E. 

 W. Tillotson, Jr. .. ... _ 267 



XXX. — On the Preparation of Cyanacetic Acid and its Ester 

 from Monochloracetic Acid ; by I. K. Phelps and E. 

 W. Tillotson, Jr. _ 275 



XXXI. — Researches on the Influence of Catalytic Agents in 

 Ester Formation. Hydrobromic Acid and Zinc Bromide 

 in the Formation of Ethyl Benzoate ; by I. K. and M. 

 A. Phelps and E. A. Eddy 281 



XXXII. — Researches on the Influence of Catalytic Agents 

 in Ester Formation. The Effect of Certain Sulphates 

 on Benzoic and Succinic Acids ; by I. K. Phelps, H. E. 

 Palmer and R. Smillie 290 



XXXIII. — Researches on the Influence of Catalytic Agents 

 in Ester Formation. The Esterification of Benzoic Acid 

 with Certain Chlorides ; by I. K. and M. A. Phelps 

 and E. A. Eddy *. 296 



