Geovije H nutington Williams. — Clarke. 77 
ity. He brought himself into contact with the intelligent 
public in several general expositions of the broader bearings 
of his interests, such as his two articles on the relation of the 
microscope to the stud}- of the rocks, published in "Science," 
and a more extended presentation of Some Modern Aspects of 
Geology, in the "Popular Science Monthly." And of wider in- 
fluence as well as of standard importance is his "Modern Pet- 
rography," published in 1886, as the first of a series of "Mon- 
ographs on Education," issued by Heath, of Boston. His 
"Elements of Crystallography" (1890), written to supply the 
needs of his own pupils, has become wideh^ adopted in insti- 
tutions of higher education in America and is understood to 
have already passed through several editions. 
His mechanical ingenuity and adeptness were shown in his 
design for the petrographical microscope constructed by the 
Bausch-Loml> compan}'^ and which has long been hatched 
upon the cover-page of this journal ; and also in the inven- 
tion of a machine for cutting and grinding thin rock-sections, 
of which the motive power is electricity. Of this useful con- 
trivance he published a description in the American Journal 
of Science for February, 1893. 
Even to this 3'oung man the honors which beautif}^ and 
crown success were beginning to come. He had been made a 
vice-president of the Geological Society of America, a corre- 
sponding member of the Geological Society of London and a 
member of the Mineralogical Society of France. Under the 
auspices of the Maryland board of managers of the World's 
Fair Commission he was given charge of the preparation of 
the state book, and in conjunction with his associate, pro- 
fessor W. B. Clark, prepared the geological part of lluit work. 
Under similar auspices he served as one of tlie judges of award 
in the Department of Mines and Mining at the World's Fair, 
and the last paper but one published by him was an account 
of the exhibits in mineralogy and petrograi)hy. whicli ap- 
peared in the Gkologist for May, 1894. 
Professor Williams's early departure has tei'minat(>d one of 
those truest lives which Dr. Holmes characterized as like a 
rose-cut diamond, with many facets answering to the many- 
planed aspects of the world about it; its influence elevating, 
its memory sweet. John ]N1. Ci,ai{kk. 
