vi CONTENTS. 
NUMBER CXLVIOL 
Art. XX VU.—Review of DeCandolle’s Origin of Gulevarede 
Plants; with Annotations upon certain American Species; 
by A. Gray and ne ye, Tomminiy ooo ees 241 
XXVIII —Remarks a Gif psactitide. and Reteocrinus, two 
mals he Silurian Crinoids ; by C. WacusmuTH an ‘ 
PPRINGWE 2 Ooh ON CSL Scuba: Bago 255 
pi peau eT ICL OE AG a er MAS i em cre Goes Bett os 268 
~The ‘Age of the Southern Appalachians; by J. B. 
ee ater em Sem ts al eee Mw Seen: Be ONS iaco he Ba cease ee 282 
ss volaton of the American Trotting-Horse ; by W. 
fei asie Uilaags tilda ep leone oe a Buena Wm ee OL Se 299 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics.—Reciprocal Displacement of the Halogens, BERTHELOT, 
305.—Action of Nascent Hydrogen in page the Ac tivity of Oxygen, 
Hoppr-SEYLER, 306.—Phosphorescent Flame of Sul phur, HeuMANN: Hydrates 
ua r Pak 8 
> wang in an electrical field, A. peace Magnetic storms, M. 
omet of 1882, THoLLON and Goux: Magnetizing ania re Steel ners Roser 
Hueo Meyer: Determinations of ibe Ohm, G. C. F 
Geology and Natural History.—Paleo-geological and Geographical nyt of = 
iti EK, Hun 
ila: Tu. W. Ene ce 0} 
croaed and Shaded Lavslisien on the Development of f Fol iage Le sites KE. Sraut, 
3.—Rabenhorst’s Kryptogamen-Flora: Hetercecism of the Uredines, C. B. 
terinary y 
GE: ientices concernant one Naturelle de ? Empire Chinois 
par des aes de la compagnie de Jésus, 
Astronomy.—Astronomical Papers of the American Ephemeris, 317.—Transits of | 
Mercury, 1677-1881, 317.— Obituary. .—Henry Seybert, 320. 
