Contents. V 
The glacial geology of the Irondequoit region. [Illus- 
trated.] Charles R. Dryer 202 
Note on a specimen of Conularia missouriensis Swal- 
low. S. Calvin 207 
The session of the International Geological Congress 
in Philadelphia. Persifor Frazer. 208 
The geological history of the Quebec group. T. Sterry 
Hunt 212 
The making of Pennsylvania. E. W. Claypole 225 
Editorial Comment. — Award of the Hayden memorial medal to Prof. 
James Hall, 236. 
Revietu of Recent Geological Literature. — The geology of Ontario with 
special reference to economic minerals, Robert Bell, 237. — 
Geological and Natural History Survey of Canada : annual report 
for 1887-88, A. R. C. Selwyn, director, 240.— On the fossil plants 
in the Ravenhead collection, Robert Kidston, 2-19. — Transactions 
of the twentieth and twenty-first annual meetings of the Kansas 
Academy of Science, 249. — Application of descriptive geometry to 
problems in locating faulted beds or veins, 250. — Bibliography of 
vertebrate paleontology for 1889, John Eyerman, 250. 
Correspondence. — Additions and corrections to Miller's North American 
Paleontology, C. L. Herrick, 253. 
Personal and Scientific News, 255. 
MAY NUMBER. 
Observations on the Keokuk species of Agaricocrinus. 
[Illustrated.] C. H. Gordon 257 
Drainage systems of New Mexico. Ralph S. Tarr. . . . 261 
New Lamellibranchiata. [Illustrated.] E. 0. Ulrich. . . 270 
Leo Lesquereux. [Portrait.] Edward Orton 284 
Artesian wells in Kansas and causes of their flow. [Illus- 
trated.] Robert Hay 296 
Crystallogenesis. H. Hensoldt 301 
The Brenham, Kiowa county, Kansas, meteorites. N. H. 
Winchell and James A. Dodge 309 
Review of Recent Geological Literature. — Report of the School of Mines 
of Colorado, Lakes, 312. — The evolution of climate, James Geikie, 
313. — Mammalian remains from the southern states, Joseph 
Leidy, 314. — Eighth annual report of the U. S. Geological Survey, 
314. — The Potomac or younger Mesozoic flora, W. M. Fontaine, 
315. 
Correspondence. — The genus Terebellum in American Tertiaries, Gil- 
bert D. Harris, 315. — The American Neocomian and the Gryphtea 
pitcheri, Jules Marcou, 315. 
List of Recent Publications. — 317. 
Personal and Scientific News.— Coal in the south of England, 318.— The 
general organizing committee for the Philadelphia meeting of the 
International Congress of Geologists, 319. 
