vi CONTENTS. 
NUMBER XXVIIL 
Art. XXVIL—Comparison of the mean daily range of the 
Magnetic ew ey and the aes er of Auroras ob- 
served ie year; by Exras Lo 
ViL— 
Page 
a. 
XXVIII. ea, some points in Dynamical Geology; by T. 
STERRY 
XXIX.—On a imple device for projecting on a screen the 
Seis sata of the needles of a Galvanometer ; Pe ALFRE 
eo AN OE ls os ee es mae ey es | 270 
XXX. “Ingemigations on Parasulphobenzoic Acid; by Ira 
REMsEN ea @0) 5... ws s55424s 4) oes ee 274 
XXXI.—Note on the Age of the Metamorphic Rocks of Port- 
and, Doles county, Wisconsin; by Rotanp D. Irvine, 282 
A 
XXXIL —On the Biel Borate of Lime (Grypeonidephite Lec 
by A. W. Cua 2 
y 
XX XI. - aeeitopatione West of the 100th Meridian, . ------ 290 
XXXIV.—On ivana; by in the Soa rocks of West- 
by W. D. Moor: 2 
+ 
e 
XXXV.—Additional Oiovieas on the Dinocerata ; hg 
). Mina 
Sphzroma, O. Hare . Co 
rangement of the Families of Fishes, de peas 315, — Arrangement of the Families 
of a Me i siding Fertilization i in Grasses, HILDEB’ 
of November 27th, 1 i872, vai Biela’s gums 317.—Meteor 
in "Kentucky, ex 12th, 1872: Double meteor of Feb. 14th, 1873, 318.—Astro- 
nomi ical Engravings from the Observatory of Harvard College: te new method 
i Chrom: Il teleseo 
Comet, and other reports from the U. 8. Naval Observat atory, "320. —Note — 
“teed sul Sole, < P. A. Seccn!: The Astronomische Nachrichten, 
Misce ‘cienti igence.—The California Academy of Sciences, oa. — 
Cirenat Col College Junior Change of a Chemistry, F. eas Ancient Stone 
sg Temes Weapons and Ornaments of Great Britain, J. Evans: Hrolution 
“% ) CHAPMAN, eel .—Address befor the Royal Sosety of of New South Wale es, 
B. CLARKE Tyndall’s works, 323. — Obituary.— Dr. John Torrey, 324. 
