26 ANNUAL REPORT OF THE 



Taylor district in the same territory, the party proceeded to 

 Prescott, Arizona. From this point a wagon trip of fifteen hun- 

 dred miles was made through the Grand Canyon district of 

 Arizona and the Basin regions of Arizona and Utah, the excur- 

 sion terminating at Salt Lake City. 



During the winter considerable time was devoted to the prepa- 

 ration of articles based on the summer's work. The following 

 subjects were treated : the volcanic necks of the Mount Taylor 

 region, the faults and folds of the Grand Canyon district, recent 

 volcanic activity in the San Francisco mountains, and physio- 

 graphic features along the western margin of the High Plateaus 

 of Utah. Reports on the volcanic necks of the Mount Taylor 

 region were presented at a meeting of the American Academy in 

 Boston and at the winter meeting of the Geological Society of 

 America in New York ; also reports on the texture of topography 

 and its origin, and on the origin of beach cusps (read by title), at 

 the meeting of the Association of American geographers in New 

 York. Several public lectures on the western excursion were 

 given during the year. 



Professor Johnson continued to give instruction in the Geolog- 

 ical department of the Massachusetts Institute of Technology 

 throughout the year. In Harvard University he gave two courses, 

 Geology A and Geology 6. The plan of instruction in these 

 courses remained practically unchanged, except that in Geology 6 

 a regular system of conferences with individual students, at stated 

 intervals, was instituted. 



The Geographical laboratory equipment has been augmented 

 by the purchase of ten new desks for use by the students. The 

 laboratory exercises in Geology A have been revised, new exer- 

 cises added, and a large number of new maps purchased. 



An elementary summer course in the Physiography of the Lands 

 was given by Professor Johnson, assisted by Mr. E. J. Saunders, 

 to a class of ten persons. In connection with this work several 

 excursions were made, including one to the Berkshire Hills and 

 another to the White Mountains. 



Dr. Mansfield reports that the work in Course 22 consisted in 

 the first half-year of the geological mapping of an area and in 

 the second half-year of special field problems. The Course Min- 

 ing 28, a half course in field geology and geological surveying, 

 given to students in the Division of Mining and Metallurgy, was 

 completed by eight students, whose field work comprised the 



