CONTENTS 



• Pa^e 



Art. XXXIII. — Rate of Coiiclensation in the Steam Jet; 



by A. deF. Palmer, Jr. With Plate IV 247 



XXXIV. — Longitudinal Aberration of Prisms; by C. G. 



Abbot and F. E. Fowle, Jr. 255 



XXXV. — Abnormal Hickory Nuts; by F. IT. Herrick. 



With Plate V _..... 258 



XXXVI. — Separation and Identification of Potassium and 

 Sodium ; by D. Albert Kreider and J. E. Brecken"- 

 RIDGE ... 263 



XXXVII.— Estimation of Cadmium as the Oxide; by P. E. 



Browning and L. C. Jones , . _ . 269 



XXXVIII. — Determination of Tellurium by Precipitation as 



the Iodide; by F. A. Gooch and W. C. Morgan 271 



XXXIX. — Notes on some Mesozoic Plants from near OrO- 



ville, California; by W. M. Fontaine ... 273 



XL.— New Method for Reading Deflections of Galvanom- 

 eters; by C. B. HiCE 276 



XLI. — Crystal Measurement by means of Angular Coordi- 

 nates and on the Use of the Goniometer with two Cir- 

 cles; by C. Palache 279 



XLIL— Search for Solar X-Rays on Pike's Peak; by F. 



Cajori /. 289 



XLIII. — Note on recently discovered Dikes of AInoite at 



Manheim, N. Y.; by C. II. Smyth, Jr. ... 290 



XLIV.— Action of Ferric Chloride on Metallic Gold ; by P. 



C. McIlhiney - . 293 



XLV.— Geology of Block Island ; by O. C. Marsh 295 



SCIENTIFIC INTELLiaENCE. 



Chemistry and Physics — Empirical Relation between Melting-point and Critical 

 Temperature, F. W. Clarke, 299. — Quantitative Separation of Chlorine, Bro- 

 mine and Todiue, Bexnett and Placeway: Homogeneity of Argon and of 

 Helium, Ramsay and Collie, 300. — Argon and Helium from a Natural Spring, 

 Ch. Moureu: Liquefaction of Helium, Olszewski, 301. 



Geology and Mineralogy — Glacial deposits, preglacial valleys, and interglacial 

 lake-formation in Subalpine Switzerland, C. S. Du Riche Preller, 301. — U. S. 

 Geological Survey: Bibliography and Jndix of North American Geology, 

 Paleontology, Petrology, and Mmeralogy for 1892-3, F. B. Weeks:. Iowa 

 Geological Survey: Elements of Geology. J. LeConte, 303. — Amount of gold, 

 and silver in sea-vrater, 304. — Brief notices of some recently described min- 

 erals, 305. — Mineralogical Lexicon of Frankliu, Hampshire and Hampden 

 Counties, Mass., B. K. EmerS')X: Recent works on Crystallography, 306. 



Miscellaneous Scientific Intelligence — American Association for the Advance- 

 ment of Science, 307. 



Obituary — JosiAii DwiGHT Whitney, 312. — George Brown Goode, 313. — 

 Sir William Robert Grove: Dr. August Kekule, 314. 



