VI CONTENTS. 



Number 22. 



Page 



Art. XXVIII. — Fractional Crystallization of Rocks; by 



G. F. Becker _ 257 



XXIX. — Eopaleozoic Hot Springs and the Origin of the 



Pennsylvania Siliceous Oolite; by G. R. Wieland 262 



XXX. — Conditions required for attaining Maximum Accu- 

 racy in the Determination of Specific Heat by the 

 Method of Mixtures; by F. L. O. Wadsworth 265 



XXXI. — Systematic position of Crangopsis vermiformis 

 (Meek), from the Subcarboniferous rocks of Kentucky; 

 by A. E. Ortmanx... _ 28a 



XXXII. — New Species of the Palinurid-Genus Linuparus 

 found in the Upper Cretaceous of Dakota; by A. E. 

 Oetmann _ 290 



XXXIIL— Studies in the Cyperaceae, VI.; by T. Holm 298 



XXXIV. — Improved Heliostat invented by Alfred M. 



Mayer; by A. G. Mayer 306 



XXXV. — Pseudomorphs from Northern New York ; by 



C. H. Smith, Jr __ 309 



XXXVI. — Chemical Composition of Hamlinite and its 

 Occurrence with Bertrandite at Oxford County, Maine ; 

 by S. L. Peneield 313 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Properties of Highly Purified Substances, Shexstone, 

 317. — Liquefaction of Fluorine, Moissan and Dewar, 318. — Normal and Iso- 

 pentane from American Petroleum. Young and Thomas: Heat of Combustion, 

 Mexdeleeff. 319. — Capillary constants of molten metals, H. Siedextopf, 320. — 

 Relations between the Geometric constants of a crystal and the Molecular 

 Weight of its Substance, G. Lixck, 321. — Induction Coil in practical work, 

 including Rontgen Rays, L. Wright. 



Miscellaneous Scientific Intelligence — British Association, 324. — Notes on Green- 

 land glaciation. R. S. Tarr: Revision of the Apodidas, C. Schdchert: New 

 Meteorite from Canada, 325. — Observations on Popocatepetl and Ixtaccihuatl, 

 0. C. Farrixgtox : L. Evolution regressive en Biologie et en Sociologie, J. Demoor, 

 J. Massart and E. Vandernelde : Birds of Colorado, W. W. Cooke: Mam- 

 moth Cave of Kentucky: an illustrated Manual, H. C. Hovet and R. E. Call, 

 326. 



