22 



of which were embodied in his thesis for the philosophical doctor- 

 ate. He conducted the elementary course in geology in the 

 summer schools, and at their close went to Munich, Germany, to 

 continue his studies. Dr. Ladd and Mr. Jagger also attended the 

 International Congress of Geologists held at Zurich. Mr. Griswold 

 attended the International Congress of Geologists at Zurich the 

 past summer, and with members of the Congress made excursions 

 through the Juras and Alps for the purpose of studying physio- 

 graphic and dynamic phenomena. 



A list of the publications of the members of the department is 

 appended to the Reports. 



Equipment. 



Since the introduction of the stereopticon in the Geological Lec- 

 ture Room two years ago, the curtains for darkening the room have 

 been raised and lowered by hand, much to the inconvenience of the 

 lecturer and the students. During the summer of 1894, Dr. Wolff 

 and Mr. Woodworth installed a half horse-power motor and wind- 

 lass, by means of which the curtains on both sides of the room can 

 be pulled down simultaneously to any desired place and released 

 at will. 



Another 2,500 candle-power arc lamp has also been imported 

 from Germany for use in the Petrographical Lecture Room, the 

 one heretofore employed being reserved for the Geological Lecture 

 Room. 



Illustrative Materials for Teaching. 



With the use of the stereopticon, the method of illustrating 

 lectures before large classes has been greatly changed. Not only 

 does the practice permit of the freer and better exhibition of pho- 

 tographs reproduced in lantern slides, but by photographing stan- 

 dard published sections, and reproducing them in the stereopticon, 

 considerable advantage both in the amount and fidelity of draw- 

 ings is gained. Following this plan, lantern slides have been 

 prepared for use in Courses 4 and 8, exhibiting the principal types 

 of mountain structure, faults, folds, etc., in their actual occur- 

 rence. To a limited extent the same method has been pursued in 

 the elementary class in the illustration of the characteristic fossils 

 of the principal geological epochs. 



It is proposed to publish for the use of colleges and schools at 



