MUSEUM OF COMPARATIVE ZOOLOGY. 19 



The more important additions to the collection are: (1) Pro- 

 fessor Davis's negatives taken during his Shaler Memorial Expedi- 

 tion to the southern Pacific. Both prints and lantern slides 

 have been made from these. (2) A large number of slides and 

 photographs obtained for Professor Atwood, many of which are 

 from his own negatives. These are to be used in the courses on 

 physiography. (3) A set of 156 lantern slides purchased from Dr. 

 Ralph Arnold illustrating the geology of petroleum. This lot 

 is not included in the foregoing table, since they have not as yet 

 been completely catalogued. For the same reason, 181 slides 

 and 109 photographs of Scottish subjects, referred to in last year's 

 report of the Sturgis Hooper Professor, have not been entered in 

 the table. 



The collection now contains an abundant supply of material 

 for use in all the courses except those on economic geology. With 

 the cooperation of Professor Graton it is hoped to supply this 

 deficiency in the near future; the policy now being to improve 

 the quality, rather than to increase the size, of the collection. 



During the year Professor Woodworth gave Courses 5, 8, 12 

 and 20c at Harvard and Courses 4, 5, 8 and 20c at Radcliffe. 

 His 20c course at Harvard was taken by two students, one a 

 candidate for the doctorate, the other, a senior, whose work counted 

 as a whole course in the second half year. The Rocky Mountain 

 Summer Course in Geology (S5) was given by him between July 

 3rd and August 6th in the region between Bozeman and Virginia 

 City, Montana. This course was taken in 1915 by seven men, 

 two from Yale University, one from the Institute of Technology 

 but now in this University, and four from Harvard. 



The work of the Seismographic Station was maintained through- 

 out the year. Monthly mimeographed bulletins of earthquakes 

 were issued to stations offering exchange of data, and a revision 

 and summary of these records prep:: red for the sixth annual report 

 of the Station. Considerable time was spent in tabulating the 

 hours at which earthquakes occur in relation to the question of 

 the hour of maximum frequency and the role played by barometric 

 changes. A paper dealing with the preliminary results of this 

 investigation has been nearly completed. 



As a result of his work upon the Walker Mountain fault block 

 in Virginia, Mr. Ellis W. Shuler received the degree of Ph.D. at 

 Commencement. His thesis deals with the structure of the fault 

 block and with the stratigraphy of a much debated geological 

 section. In the summer of 1915, Mr. Ralph P. Wentworth, a 



