CONTENTS. sd 
NUMBER IX. 
Page 
Arr. XXI.—On the Testimony of the se tag ee toh o the os 
truth of the Nebular Hypothesis; by D. Kir 155 
XXII.—On the time required to communicate AE essions ont 
the Sensorium, and the reverse; by T.C. MenpEnnALL, 156 
XXIL—On we amount of Time necessary for Vision ; by 
. Roo 
XXIV.—On the nature and duration of the discharge of 
a Leyden Jar connected with an Induction Coil, Part 
Sesond< by OF N-Roop... c,h ete 160 
X1V.—Memoranda concerning the introduction of the 
Manufacture of Spelter into the U.S.; by J. Wuarron, 168 
XXV.—The Daily Motion oh a Bie: ck Tower, caused by Solar 
Seat by Co GO ae Won ele as 177 
XXVI—On the destructive Distillation of Light Petroleum 
oN ep at low temperatures; by S. Dana Hayes, -. 184 
XVIL—The Paragenesis and Derivation of Copper and its 
associates on Lake Superior; by OMPRILY, 2205, 188 
xX aiinebregs oleteres on b Color of Fluorescent Solu- 
tone; ly Haney Moeron. °° 0S oso 198 
TX —-Doinposition OF hs Meteorie Stone that fell near 
geet Maine, May 21, 1871; by J. L. Sarrn,_-_--- 200 
XXX.—Discovery of a new Planet; by C. = o Seema 201 
XXXI.—A new Planet; by Jamxs C, Watson, .. 5-2-2: 201 
SCIENTIFIC INTELLIGENCE 
Chemistry and Physies,—On the existence and formation of ieee of Nitrous Oxi 
On a group of Mercurial Colloids, REYNOLDS, 202.—A new Syn set = Acide 
Von Ricuter: Gallein, 203.—Decomposition of Chinasaites R. men 
Geology and Rares Seay —Address to the American Associ 
Botany, by E. BrerscHNEIDER: Plants killed ty F eee 
Astronomy.—Scintillation of the Stars, L. RESPIGHI, tee the recent Solar 
Eeli . N. Lockyer, 226.—Shooting § geste August 10th-11th: On = Matont 
seen at Wilmington, N. C., E. S. Mar 
} ] ius Dredging, under the direction of the 
can Naturalist, 229.— Obituary.—Edw. Claparéde: A. K. Johnston, 229. 
Bibliography.—Dr. Ellis’s A ra Sir Benjamin beam pono dl 
ie, Von 
