Vili * CONTENTS. 
LI,—On a new Micrometic Goniometer eye-piece for the Mi- 
SECBCODG |. OY Vv. 2 + DOUTAWORITES oie eee bu caine 408 
LIJ.—On the bearing of Devonian Botany on Questions as to 
the Origin and Extinction of Species; by J. W. ae 410 
LII.—On some Phenomena of Sinadae Vision; by JosE 
MO Bae wir oe tae worse Gees wb Yes is oad 417 
LIV.—The American Spongilla, a craspedote, flagellate In- 
fusorian; by H. James-Crarx. With a Plate,..______ 426 
LV. = Deseription of a Printing Chronograph; by Ga W; 
LVL. —Longitu Determination across the Continent; by 
RGE oak LE ee a ae ae ee aa: 441 
LVII. ere of the Invertebrata dredged i in Lake Superior 
in 1871 oe ee U.S. Lake Survey; by S. I. Surra and 
dee MeV MAREN, oo i 448 
LVIIL—On Kilauea and Mauna Loa; by Trrus Coan, -... 454 
SCIENTIFIC INTELLIGENCE. 
Chemistry and Physics.—On the ee to light of the haloid salts of silver, 
and the connection ‘between optical and che cag absorption of light, og deena 
LLACK: On the proteine series, Tuaciwort d H. , 457.—On the pro- 
ducts of the reduction of silicic ether and some of its derivatives, 5 eieyy 458. 
Geology and Natural History.—Triassic Sandstone of the Palisade Range, 459 
Martius, Flora Brasiliensis, 460.—Baillon’s Histoire des Plantes, 461 —Ba tisk 
Acid by Foliage, 464.—-Herbarium for sale, 4 “a 
ag enn athonsee on the Spectrum of ee Aurora, Gro. F. BARKER, 465.—An 
Explos e Sun, C. A. Hho te 8.—November Meteors in 1871, 470.— 
Aaeeroid ( (ii 17): ured s Comet, 471 
Miscellaneous Scientific Intelligence—Plattner’s Manual of Qualitative and Quanti 
tive Analysis with the Blowpipe: Geological seen under ation: Ha ay aL. 
—-Madagascar, — abel: On Sea Wav pe ere 473. 
On a Meteor seen at Alexandria, Egypt, B. Kr bathers Kansa tee of Sci- 
ences: The Fossil Plants of the Saverion and Upper Pan ag oe pane 475. 
Inpex, 476. 
ERRATA. 
Page 20, 2d line of npoarerats for by yosen etc., read cellular or, etc. 
24. line 16, for represent, re 
“24, lines 4 and 10 from eeagee for ¢ Cacteria, read bacteria. 
* 62, line 31, for nassiform, read na apiforn. 
. 62, line 33, for -petaled, read -petioled. 
4 80, line 8 from bottom, for 1860, ss 1869. 
* 205, ine : >Re 7, the proportion of nitre referred to is that of fused nitre. 
a 227, line rom bottom, for vena read ten. 
