13 



of Geology, to a class of sixty-seven undergraduates and two members 

 of tlie Scientific School. Voluntary excursions to points of interest in the 

 neighborhood of Cambridge and Boston were made on several Saturday 

 afternoons during the fall and spring. 



In Advanced Geology. Lectures twice a week, fall and spring, three 

 times a week through the winter, based on Lyell's " Principles of Geol- 

 ogy," to a class of seventeen undergraduates and one Scientific student. 

 Weekly excursions were made during the fall and spring to quarries and 

 ledges in Somerville and Brighton, under the direction of the instructor 

 and Mr. J. E. Wolff, assistant in Geology. 



During the May recess, Messrs. Davis and Wolff, with five 

 students, visited an interesting region between the Hudson River 

 and Catskill Mountains, near the town of Catskill, N. Y. A short 

 account of part of the results of the trip was published under the 

 title of " The Little Mountains East of the Catekilla " in Appa- 

 lachian Vol. III. A fuller description of the work done will be 

 published in the Bulletin of the Museum. 



Papers in addition to the two above named were prepared 

 by Mr. Davis on the " Classification of Lake Basins " and on 

 " Glacial Erosion ; " the first published, the second in press in 

 the Proceedings of the Boston Society of Natural History ; and 

 by Mr. Wolff on the Building and Paving Stones used in Boston 

 (a report made to the U. S. Census), and on " The Great Dike at 

 Hough's Neck, Quincy, Mass.," published in the Museum Bulle- 

 tin. Mention may also be made of some geological work con- 

 tinued for the past three summers on Mt. Desert by a party of 

 undergraduates, many of whom were, or had been, students in 

 this department. Mr. Davis spent part of two vacations in their 

 camp. An account of their results, with a geological map of the 

 island, is now in preparation. 



