MUSEUM OF COMPARATIVE ZOOLOGY. 17 



To the. numbers given in this table should be added six students 

 who were enrolled in Mining 28 lhf., a course given in the Geo- 

 logical Museum. It may here be noted that Geology 10 (The 

 origin and geological relations of ore-deposits), given by Professor 

 H. L. Smyth, has, by vote of the Division of Geology, now been 

 turned over to the Division of Mining, and that the course in Eco- 

 nomic Geology (Geology 18), from which Professor Smyth has 

 withdrawn, has been somewhat rearranged, and will hereafter be 

 given in the Department of Geology and Geography by Professors 

 Wolff, Woodworth, and Palache. Further details regarding the 

 courses of instruction will be found in the accompanying reports of 

 the Departmental staff. Messrs. Augustus Cobb, J. W. Eggleston, 

 F. H. Lahee, and B. M. Varney were assistants in the Department. 



Owing to the small attendance upon the summer courses in 

 geology and geography offered in Cambridge during several years 

 past, the Department this year devoted its available resources to 

 the development of courses given away from Cambridge Pro- 

 fessor Davis offered an extended course of physiographic field 

 work in northern Italy and southern Switzerland, as did also Pro- 

 fessor Johnson in Central France. Professor Wolff offered a course 

 in southern Montana, and Dr. Mansfield gave, in Montana, a 

 course equivalent to Geology 5 of the winter term. Under special 

 conditions, one student, acting as assistant, was admitted to the 

 Shaler Memorial Expedition to South America, with the privilege 

 of counting completed field studies in Brazil as a half-course. 



The two events of most importance in the activities of the 

 Department during the year were (1) the installation of the seismo- 

 graph, and (2) the sending of the Shaler Memorial Expedition to 

 South America. ' 



The Bosch-Omori loo kilo, seismograph or "tromometer,"- 

 referred to in last year's Report, arrived in Cambridge at the end 

 of 1907, but owing to numerous delays was not completely installed 

 and in operation until April 8, 1908. The instrument is mounted 

 on an L-shaped concrete pier whose base, which is as deep as the 

 foundation of the walls of the geological section of the Museum, 

 i. e., about 3 feet, rests on undisturbed stratified sand of glacial 

 origin overlying clay of unknown depth. While the depth is not 

 known, it probably equals, if it does not exceed, 50 feet, since 

 a boring at the north side of the Museum encountered no rock at 



