20 ANNUAL REPORT OF THE 



and upon the larger question of the ancient water-levels of the 

 Hudson and Lake Champlain valleys. As contributory to the 

 preparation of these reports, trips were made to Washington, D.C., 

 during the mid-year period, and to certain localities in the Hudson 

 Valley during the April recess. 



Professor Jaggar reports that the advanced field course in Geol- 

 ogy was taken by thirteen students, who completed the survey of 

 the Metropolitan District of Boston, which was commenced in 

 1900, at the time when the work was first given into Professor 

 Jaggar s hands. A large topographic map was prepared, showing 

 the entire metropolitan district, with topography compiled from 

 the best available sources, and on this map all of the geological 

 records of the past five years were inscribed in color. This map 

 will be put on exhibition beside the large Boston model in the 

 Geological Exhibition Rooms. Messrs. R. W. Richards and H. 0. 

 Wood acted as Assistants in this course. Mr. Richards also made 

 a large number of photographs in illustration of the field-work of 

 the year, and Mr. Wood supervised the cataloguing and recording 

 of all the specimens which have been collected in the metropol- 

 itan district. The year's work, therefore, has produced the 

 following new materials : a topographical and geological map of 

 Boston ; a systematic collection of rock specimens ; a collection of 

 about one hundred photographs of Boston localities. Professor 

 Jaggar continued his work as a teacher in the Massachusetts In- 

 stitute of Technology, and one student from that institution was 

 given a course in Experimental Geology in the Harvard laboratory 

 in the spring of 1904. During the summer of 1903, in collabora- 

 tion with Professor Palache, Professor Jaggar completed the 

 geologic folio of the Bradshaw Mountains of Arizona, for the 

 United States Geological Survey. In December, 1903, he spent 

 three weeks in Searchlight, southern Nevada, making investiga- 

 tions for the Quartette Mining Co. of Boston. Professor Jaggar 

 conducted a summer course in geological surveying to the Black 

 Hills and Big Horn Mountains of South Dakota and Wyoming in 

 the summer of 1904. 



Mr. P. S. Smith conducted the course in Elementary Physi- 

 ography along the same lines as in previous years, special attention 

 being paid to the laboratory exercises. The same course was 

 repeated for students of Radcliffe College. Mr. Smith, as previ- 

 ously noted, also acted as Assistant in Courses 4 and 8, and 

 replaced Mr. J. M. Bell, who was given leave of absence on May 



