MUSEUM OF COMPARATIVE ZOOLOGY. 13 



REPORT OF THE STURGIS-HOOPER PROFESSOR 



OF GEOLOGY. 



By William M. Davis. 



My return to Cambridge was delayed until after the beginning 

 of the Academic year on account of the journey around the east 

 coast of Africa with the party of the British Association on their 

 way home from the meeting in Cape Colony, the Transvaal, 

 and Rhodesia. I reached Cambridge, November 4. During the 

 winter a significant share of time was given to the preparation of 

 articles embodying the results of observations in South Africa. 

 The chief topics treated were: the Dwyka glacial formation, con- 

 cerning which reports were made at the meeting of the National 

 Academy in New Haven (November) and at the meeting of the 

 Geological Society of America in Ottawa (December) ; the origin 

 of the Yeld, or the interior highland plain of South Africa ; and 

 the topographic development of the east and west Cape Colony 

 ranges, which present many striking analogies with the Appala- 

 chians of Pennsylvania. Public lectures on the African excursion 

 were given on several occasions. 



The two courses of instruction remained unchanged from 

 former years, except that an increasing amount of laboratory 

 work was added to the course on the physiography of the United 

 States in the second half-year. 



The latter half of the summer of 1906 was spent in Mexico, in 

 connection with the meeting of the International Geological Con- 

 gress. Excursions were made to western Mexico, under the 

 leadership of Sr. Ordonez, to visit the modern volcano of Jorullo, 

 famous from its description by Humboldt ; to various points on 

 the central plateau ; and to the eastern slope and coast, where a 

 good understanding was gained of the chief topographic features 

 there developed. 



