38 



ANNUAL REPORT OF THE 



REPORT ON THE INSTRUCTION IN PETROGRAPHY. 



By Professor J. E. Wolff. 



The usual courses were given in Elementary and Advanced 

 Petrography, the former attended by six and the latter by three 

 students. Two students obtained the Ph. D. degree, presenting 

 theses on petrographical subjects, viz. : — 



Mr. L. G. Westgate : Thesis " On the Geology of the Northern Part 

 of Jenny Jump Mountain, Warren County, New Jersey" (published in 

 the Annual Report of the State Geologist, 1895). 



Mr. R. A. Daly : Thesis " On the Porphyritic Gneiss of New Hamp- 

 shire." 



Professor Wolff continued his work on the Franklin, New Jersey, 

 sheet of the Geological Map of the United States, and was engaged 

 during the winter on the Monograph on the Crazy Mountains. A 

 short paper was published in the American Journal of Science, 

 " On an Occurrence of Theralite in Costa Rica." 



The work of consolidating the Laboratories of Petrography and 

 Mineralogy has been completed, and the two rooms used for 

 Petrography on the second floor of the Geological Section of the 

 Museum have been vacated, and their contents transferred to the 

 Mineralogical Section. The Department Library has been arranged 

 and increased by the transfer of the leading periodicals from Gore 

 Hall, and by purchase of books. The Chemical Laboratory is now 

 thoroughly equipped for analysis. A machine for cutting rocks by 

 an endless revolving wire has been added to the workshop. 



