AS- 
V. I 
Contents. 
Editorial comment. — Prof. Judd on the lav.-is of Krakatoa, I92.~-Preglacial 
man, iQ3. 
Review of recent literature. — Geology and mining industry of Leadville, 
S. F. Emmons, 194. — Note on fossil wood and other plant remains from 
the Cretaceous and Lamarie formations of the western territories of 
Canada, Sir William Dawson, 195. 
Neiv publications., 197. 
Personal and Scientific JVews, 198. 
APRIL NUMBER. 
Diabase dykes of the Rainy lake region. [Illustrated] 
Andrew C. Lawson 199 
Darwin and geology. [ 1 1 ]• E- W. Claypole 211 
On the occurrence of later Cretaceous deposits in Iowa. 
[Illustrated] C. A. White 221 
On Sceptropora, a new genus of bryozoa, with remarks 
on Helopora Hall, and other genera of that type. 
[Illustrated] E. O. Ulrich 228 
The Taconic system as established by Emmons, and the 
laws of nomenclature applicable to it. S.A.Miller. 235 
Editorial Comment. — The rights of intelligence under paid service, 245 — 
The use of the termination yte for names of rock, 249. 
To all American Geologists. Persifor Frazer, 250. 
JRevieiv of recent literature. — On the structure and affinities of the genus 
Pariceria Carp., H. Alleyne Nicholson, 255. — A brief narrative of 
the journeys of David Thompson, J. B. Tyrrell, 256. — Contributions 
to the paUtontology of Brazil, comprising descriptions of Cretaceous 
invertebrate fossils, Charles A. White, 257 — Preliminary report on 
seacoast swamps of the eastern United States, N. S. Shaler, 258. — 
On nepheline rocks in Brazil, with special reference to phonolite and 
foyaite, Orville A. Derby, 259. — New notes on Eozoon, Dawson, 
260. — Solubility of shells of Aragonite, Cornish and Kendall, 260. 
Experiments on the rounding of pebbles, Prof. Bonney, 260. 
Personal and Scientific Ne^vs., 261 . 
MAY NUMBER. 
A new genus of crinoids from the Niagara group. S. A. 
Miller 263 
The Niagara shales of western New York; astudy of the 
origin of their sub-divisions and their faunas. Eugene 
N. S. RiNGUEBERG, M. D 264 
Notes on the Pittsburg coal bed and its disturbances. 
Henry A. Wasmuth, M. E. [Illustrated.] 272 
Geyserite in Nebraska. Dr. Lewis E. Hicks 277 
i\ contribution to the Archccan geology of Missouri. 
[i.] Erasmus Ha worth. [Illustrated.] 280 
The reef-builders. Dr. Lewis E. Hicks. [Illustrated.] 297 
