CONTENTS. 



Number 279. 



Page 



Art. XVII. — Continuity of the Glacial Period; by G. F. 



Weight . ... — '.- 161 



XVIII. — Chemical Composition of Chondrodite, Humite and 



Clinohumite ; by S. L. Penfield and W. T. H. Howe 188 



XIX.— Deformation of the Lundy Beach and Birth of Lake 



Erie ; by J. W. Spencer _ 207 



XX. — Crystallization of Enargite; by L. V. Pirsson 212 



XXI. — Relations of the Lower Menominee and Lower Mar- 

 quette Series in Michigan (Preliminary) ; by H. L. 

 Smyth 216 



XXII. — Six and Seven Day Weather Periods; by H. H. 



Clayton . ..._-. 223 



Appendix. — XXIII. — Restoration of Camptosaurus; by 



O. C. Marsh. (With Plate VI) 245 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Cryohydric Temperatures. Schreinemakers : Use of 

 Phenanthrene as a Solvent in Cryoscopic determintions, G-arelli and Ferra- 

 tini: Vapor- pressures of solutions of Sulphur and Phosphorus in Carbon disul- 

 phide, Guglielmo, 232. — Influence of Heat on Chemical Reactions. Lemoine: 

 Motochemistry or Stereochemistry, Molinari, 233. — Densities of Oxygen, Hy- 

 drogen and Nitrogen, Rayi.eigh, 234. — Free Hydroxylamine, Bruhl: A new 

 Sulphide of Carbon, von Lengyel, 235. — Emission of Gases, F. Paschen: 

 Apparatus for studying and showing electrical resonance, A. Right, 236. 



Geology and Mineralogy — Devonian (Oriskany) in the Southern Appalachians, 

 C. W. Hayes, 23V. — Marine shell fragments in drumlins near Boston, W. 

 Upham, 238. 



Botany — Etude sur la constitution de l'appariel fructincateur des Sphenophyllum. 

 P. Zeiller, 239. 



Astronomy — Constant of aberration, 242. 



Miscellaneous Scientific Intelligence— Sea-water and sea-bottom deposits of the 

 Eastern Mediterranean, 242. — Electric Waves ; being Researches on the Propa- 

 gation of Electric action with finite velocity through space, Dr. H. Hertz. 244. 



