394 'Tlie AniericaiL Geologist. December, i898 
Winchell, N. H. 
Origin of the Archean igneous rocks. (Am. Geol., vol. 22, pp. 299- 
310, Nov. 1898.) 
Woolman, Lewis (and Charles S. Boyer). 
Fossil mollusks and diatoms from the Dismal swamp, Virginia and 
North Carolina; indication of the geological age of the deposit. (Proc. 
Acad. Nat. Sci., Phil., Part 2, April-Sept. 1898, pp. 414—) 
Wright, G. Frederick. 
Glacial Observations in the Champlain-St. Lawrence valley. (Am. 
Geol., vol. 22, pp. zZ7>-7>2>^, Nov. 1898.) 
Yeates, W. S. (S. W. McCallie and Francis P. Kingj. 
A preliminary report on a part of the gold deposits of Georgia. 
(Bull. 4-A, Geol. Sur. Georgia, pp. 542, maps, 21 plates, 1896.) 
PERSONAL AND SCIENTIFIC NEWS. 
Mr. Oscar H. Hershey, of Freeport, Illinois, returned 
home November 14th, from the Isthmu.s of Panama, where, 
in this and a former journey, he has united geological ob- 
servation with gold prospecting. 
Mr. J. B. Tyrrell, for 15 years past one of the geolo- 
gists of the Canadian survey, spent the past summer in the 
Yukon district. He is now planning to engage in economic 
explorations and surveys in the vicinity of Dawson, leaving 
Ottawa about the first of January. He will be prepared to 
report on the extent, character and value of mining proper- 
ties. 
Dr. M. E. Wadsworth has resigned the presidenc)' of 
the Michigan College of Mines, to take effect May 15, 1899. 
Dr Wadsworth was also granted leave of absence from Dec. 
23, prox. In his letter of resignation fee calls attention to 
the growth of the institution since his administration began, 
and to the excellent condition in which he leaves it. "The 
stormy and arduous duties" of president of such an institu- 
tion have not such attraction as the quiet and peace of a 
professorship, and Dr. Wadsworth desires to complete 
sundry scientific work which was begun long ago — an ac- 
complishment which he has found impossible with the exec- 
utive duties of the presidency resting on him. 
Mr. George Bird Grinnell, in Science of November 18, 
describes a visit made by him to the Blackfoot mountains in 
northwestern Montana, accompanied by Mr. J. B. Monroe. 
Two important geographic points were established, viz: the 
location and character of the Pumpelh' glacier, and the po- 
