C O N T E N T S . 



P&GT6 



Art. XV.— Evolution of the Horse Family, as illustrated in 



the Yale Collections ; by R. S. Lull 161 



XVI. — Clay of Probable Cretaceous Age at Boston, Massa- 

 chusetts ; by F. G. Clapp . 183 



XVII. — Lower Huronian Ice Age ; by A. P. Coleman . 187 



XVIII. — New Species of Baptanodou from the Jurassic of 



Wyoming ; by C. W. Gilmore 193 



XIX. — Almost Complete Specimen of Strenuella strenua 



(Billings); by H. VV. Shimer 199 



XX. — Changes of the Colloidal Nucleation of Dust-free Wet 



Air in the Lapse of Time ; by C. Barus 202 



XXL — Use of Succinic Acid as a Standard in Alkalimetry 



arid Acidimetry ; by I. Iv. Phelps and J. L. Hubbard 211 



XXII. — Divergence and Curl ; by E: B. Wilson 214 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Misconception of Critical Temperature, J. W. 

 Gregory : New Determination of Free Sulphur, E. Berger, 221. — Detec- 

 tion of Traces of Zinc, Bertrand and Javillier : Compounds of Ferrous 

 Salts with Nitric Oxide, Manchot and Zechentmeter, 222. — Chemical 

 Abstracts of the American Chemical Society: Perception of Sound Direction, 

 Eayleigh, 224. — Ionization of the Atmosphere over the Ocean, A. S. Eve : 

 Diurnal Periodicity of the Ionization of Air, Wood and Campbell, 224. 



Geology and Mineralogy — U. S. Geological Survey, 2?th Annual Eeport, C. D. 

 Walcott, 225. — Publications of U. S. Geol. Survey : Eate of Eecession of 

 Niagara Falls, G. K. Gilbert, 226.— Geol. Eeport on Bay Co., Mich., W. F. 

 Cooper: Illinois State Geol. Survey, H. F. Bain, 227. — Postglacial Faults 

 of East. New York, J. B. Woodworth : Lunar and Hawaiian Physical 

 Features Compared, W. H. Pickering, 22S. — Origin of Laterites, M. 

 Maclaren, 229. — Eoches alcalines de l'Est-Africain, Arsandattx, 2b0. — 

 Theory of Glacial Motion, O. W. Willcox : Decomposition of Feldspars, 

 Cushman and Hubbard, 231. — Minerals from Lyon Mt., N. Y., H. P. 

 Whitlock : Synopsis of Mineral Characters for Laboratory and Field Use, 

 E. W. Eichards : Native Copper from Bisbee, 232. 



Paleobotany and Zoology — Cretaceous Flora of Southern New York and New 

 England, A. Hollick, 233. — Life and Work of Bernard Eenault, D. H. 

 Scott, 234. — Present Position of Palaeozoic Botany, D. K. Scott : The Seed, 

 a Chapter in Evolution, If. W. Oliver, 2J5. — Araucarieas, Seward and Ford: 

 Florule Portlandienne, Fliche' and Zeiller : Euaetic flora of Persia, Zeil- 

 lek : Affinities of certain Cretaceous Plant Eemains, A. Hollick and E. 



C. Jeffrey, 236. — Paleobotany of the Cretaceous of Long Island, A. Hol- 

 lick : Tertiary Lignite of Brandon, Vt., G. H. Perkins : Sutclima insignis, 



D. H. Scott: Cycadofilices, D. White: Seeds of Aneimites, D. White, 

 237. — Microsporangia of Pteridosperniea?, E. Kidston : Flora der unteren 

 Kreide Quedlinburgs, P. B. Eichter : DictyojDUyilum und Camptopteris 

 spiaralis, A. G. Nathorst, 238. — Clathropteris meniscoides, A. G. Nat- 

 horst : Germinating Spores in Stauropteris oldhymia, D. H. Scott, 239. — 

 Tubicaulis Sutcliftii, Marie C. Stopes : Structure of Sigillaria elegans, 



E. Kidston : Megaspore of Lepidostrobus f oliaceus, Eina Scott : Algue 

 Oxfordienne, O. Lignier : Brilleiikaimane, Brazil, F. Siebenrock, 240. — 

 Maldive and Laccadive Archipelagoes, 241. 



Miscellaneous Scientific Intelligence — Annual Eeports of the Smithsonian 

 Institution, 242. — U. S. Coast and Geodetic Survey : Carnegie Institution 

 of Washington, 243. — Carnegie Foundation for the Advancement of Teach- 

 ing ; First Annual Eeport : Meteorite from Selma, Ala., 244. 



Obituary — Sir Michael Foster : Prof. D. I. Mendeleef, 244. 



