20 ANNUAL REPORT OF THE 



the Boston Basin, with the result that fossils were found by them 

 in the sandstones of the Roxbury conglomerate in Mt. Hope 

 Cemetery. One student did office-work during the winter in 

 completing field studies performed during the summer, under the 

 direction of Mr. Woodman, in Nova Scotia. 



In 1898-99 Mr. L. La Forge made a critical examination, 

 under Mr. Woodworth's supervision, of the bibliography of the 

 boundary between the Devonian and Carbonic systems of New 

 York and Pennsylvania in continuation of the field studies pre- 

 viously carried on by him in the region about Olean, N. Y. It 

 is expected that this work, with field studies connected therewith, 

 will be completed for publication. Mr. La Forge also made a 

 special study, under Dr. Jaggar's direction, of the eruptive rocks 

 associated with the Cambridge slate. In the experimental labora- 

 tory Mr. Howe completed an experimental research on igneous 

 intrusion, and his thesis has been accepted for publication by the 

 U. S. Geological Survey, as a chapter in a paper on " The Lac- 

 coliths of the Black Hills," by T. A. Jaggar, to be published in 

 the 21st Annual Report of the Director of the Survey. In the 

 spring of 1899 a half-course of lectures on the Geology of the 

 United States was given for the first time by Dr. Jaggar, with 

 an attendance of thirteen chiefly advanced students. 



In 1899-1900, the course in advanced field work (Geol. 22), 

 formerly divided among several instructors, was placed under Dr. 

 Jaggar's sole charge. The students now make permanent collec- 

 tions and notes according to a uniform system, and these records 

 are preserved in the laboratory with a view to eventual publication 

 of a geologic map of the region about Boston. Each student sur- 

 veys an area in the fall, and presents a mid-year report, map, and 

 sections ; in the spring he investigates a field and library topic, so 

 that the year's work yields both areal and topical treatment of 

 field problems. The Metropolitan Park Commission of Boston 

 has rendered valuable assistance by furnishing maps and permits 

 to the students carrying on this survey in the reservations under 

 their control. 



Mr. Howe continued his experimental studies in the winter of 

 1899-1900, perfecting apparatus for the study of Erosion and 

 Drainage. Mr. H. T. Burr finished a field study of the Brighton 

 melaphyr, which has been accepted for publication in the Bulletin 

 of the Museum. Mr. La Forge completed studies of the structure 



