MEMORIAL OF GEORGE H. WILLIAMS. 4o5 



as a field for })er8onal research, but also as nature's laboratory, in which 

 younji men niiijjlit be trained in the most exact methods of scientific in- 

 vestigation. From the very first his enthusiasm and his luminous man- 

 ner of interpretation drew students to liim, while his devotion to their 

 interests made a close bond of sympath}^ which lasted beyond their 

 student days. 



While engaged ])rimarily in the stuch' of the <2;eolo<^3' of INlaryland, 

 Dr W'iUiams took up other })roblems during his absence from Baltimore 

 in vacation time, collecting data and materials that formed the basis for 

 more extended examination in tlie laboratory. On(; of the most signifi- 

 cant investigations of tliis character dealt with the '' Cortlandt series of 

 the Hudson and the contact i)henomena i)roduced on the adjoining 

 scliists and limestones." A series of pai)ers u[)on tliis subje(;t was j)ub- 

 lislied in tlie American Journal of Science. 



The sunnners of 18S4 and ISSo were spent in the Menominee and 

 Marquette regions of Michigan, and the ol)scrvations made upon the 

 greenstone-schists of those areas and the later microscopic study of the 

 material collected, constitute the largest single contribution made l)y 

 Professor Williams to geologic literature.* Besides the discussion of the 

 detailed geology, this publication is a comi)lete digest of the subject of 

 metamorphism in its relations to erui)tive rocks. 



During the summer of 1888 Professor Williams joined his former 

 teacher. Professor Rosenbusch, and several of the leading geologists of 

 Norway, upon an expedition to portions of that country, where problems 

 not unlike those which he had had under consideration in America gave 

 him an aljundance of comparative material and a great fund of infor- 

 mation for his class-room work. 



Meanwliile Professor Williams had pre])ared many smaller essays 

 upon l)oth mineralogical an<l geological topics, while numerous reviews of 

 current .\merican petrographical literature ai)pcared in scientific j(nirnals, 

 both at home and abroad. As expert editor upon mineralogy and petrog- 

 raphy for the Standard Dictionary and Johnson's Cyclopedia, he either 

 |M'rs(»nally j)rcpared the articles relating t(j those sul>jects or carefully 

 supervised the work of others. From the first an associate editor of the 

 Journal of Geology, he frequently contributed to its columns. 



Although so actively engaged in scientific work, the needs of the class- 

 room werekej>t constantly in view. The lack of a suital>l(> text-l)ook for 

 students in crystallography 1<m1 to tbc i)reparation of bis " Klements of 

 Crystallography," which hiis come to l)e almost universally used, both in 



*The volume, containing some 'i.50 pugcs, with numeruUM plutcs, appearud lus liullutiri G2 of tho 

 U. 8. Ocolo{$ioAl Survey. 



