CONTENTS. vil 
NUMBER LXXXIX. 
Page 
Arr. XLVIL. gag eet. on the Absolute Unit of Electrical 
Resistance ; by y A. Row ji cteeee ces eee 
XLVIIT.—Meteorie fron peo Vieginia: by J. W. Matiet,.. 337 
rift Fo 
L.—Geographical and Geological Survey of the Rocky 
Mountain Region, under the direction of J. W. Powell,. 342 
LL—Just Tacsnaton 3 in Music ; by H. Warp Poots,.----- 359 
LII.—Brachiopoda in the Swedish Primordial: ; by 8. Ww. Forp, 364 
LIT.—On the “ Geodes” of the Keokuk Formation, and the 
Genus popes by Samoms J. WALLACE, . 2 J...242. 366 
LIV.—The Coralline, or Magars Timestove ‘of the Appala- 
chian ed. e PAREBTES, coor ee oe neces 370 
LV.—Isopoda from ow England ; ee Oscar Harcer,. ---- 373 
L monio-argentic Iodide; by M. Carry Lra,.---- 9 
—Am y M. y Lea 
LVII.—Fossil Passerine Bird from Colorado; by. J. A, 'ALLEN, 381 
LVIUI.—Terrestrial Electrical Currents; by W. L. Brovun,.. 385 
LIX.—Notice of New Fossil Reptiles ; by O. C, Marsn,.... 409 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics.—Specific Heat of Beryllium, Nitson and Perrersson: Syn- 
thesis of Olefines, E:rexorr, 386.— Transformation of Olefine bromides into bro- 
les DEM 
etc. eae 387. — Distillation of _ and resin acids with zine dust, 
ean Sa tains eed the Falls of the Ohio, James Hatt, — 
—Fossil Plants of the Se yowsiager Gravel Deposits of the Sierra Nevada, 
LEsQurrEvx: Fossil wood from the Keokuk form oe S. J. WaLtace: has 
accompanying the Report of the Getlogics! Exploration of the Fortieth hie 
C. Kine, 396.—Geological and Geographical Atlas oF bart F. : 
Botany and Zoology.—Synoptical Flora of North America, Gray: Bibhographical 
are to North American ager case ‘Ss. Wamso N, 400.—Some points in the Morph- 
of Prim hy of Floral Aistivations, etc., G. 
H 
U. * 
mioe 401.—Floral Stru sare a and k ‘Affinities of Sapotaceze, ag M. Hartoe: 
North American Plants: Spore-Formation of the Me esocarpex, V B. Wrrrrock, 
402.—Non-Sexu al O spegcapee — on Fern Proth oe 403. —Cata logue of the Flower- 
ants wi s of Yale College 
Astronomy.—Der ae x Persei, ete., H. . ee OGEL, 404. Reo eerie Jouraes 3 
of Mathematics : Publications of the Cin cinnati Observatory, 406. 
mre gy vents 
on Chemistry, H. e and C. Rep 
tendent of the Coat Boasts for 1874: Minneahe peice. of Nai atural 
oe Re tions to North Ame bsacig tomy 
8. Powers, 407. a ey ARLES PICKERING, 408. 
