George llnntinijton H'if/iams. — C/ar/re. 75 
of professor Williams's published work; that may be reserved 
for another occasion and writer. Here its results and condi- 
tions are briefly summarized. 
During his university life in Germany, in the interval be- 
tween his semesters at Gottingen and Heidelberg, Mr. Wil- 
liams made a tour of southern and southeastern Europe, 
bringing back with him the materials for his first scientific 
publication, "Glaukophangesteine aus Norditalien," which 
was printed in the Neues Jahrbuch fiir Mineralogie in 1882. 
This was followed in 1883 by his inaugural dissertation, pub- 
lished in the same journal, on the Eruptive Rocks of the vi- 
cinity of Trj'^berg in the Black Forest, an elaborate investiga- 
tion which elicited the applause of geologists best able to 
appreciate it. 
The work of a geologist is preeminently what his environ- 
ment makes it; hence with Dr. Williams' return to America 
and the commencement of his work at the Johns Hopkins 
University his attention was directed to geological problems 
presented b}^ the region about him. In 1884 he began a series 
of papers pertaining to the petrography of the vicinity of 
Baltimore, publishing two in that year and continuing them 
for nearl}^ ten years. Twenty papers and maps published 
during this period may be regarded as pertaining to this sub- 
ject, and the outcome of his geographical location. Many of 
the briefer of these papers appeared in the University Circu- 
lars, a mode of publication in which the author evinced his 
patriotism for his patron institution, even at the risk of hid- 
ing his work from a great part of the interested world. But 
under the auspices of the United States Geological Survey, 
with which he became connected soon after his appointment 
at Johns Hopkins, he was enabled to elaborate his results in' 
detail, publishing in 1886 an important bulletin (No. 28) on 
the Gabbros and associated Hornblende Rocks occurring in 
the neighborhood of Baltimore. In his Guide to the Crystal- 
line Rocks of Baltimore and vicinity, prepared for the meet- 
ing of the American Institute of Mining Engineers in that 
city in 1892, the geological map of Baltimore and vicinity, 
published by the University in 1892, the Baltimore sheet pre- 
pared in collaboration with Nelson H. Darton, for the Geo- 
logic Atlas of the United States, professor Williams was cna- 
