12 ANNUAL REPORT OF THE 



REPORT OF THE STURGIS HOOPER PROEESSOR OF 



GEOLOGY. 



By Reginald A. Daly. 



While continuing to act as departmental chairman, instruction 

 was given in Geology 4, 9, and 20c. 



During the year a paper on the geology of Pigeon Point, Minne- 

 sota, two papers on the coral-reef problem, a fourth on the genetic 

 classification of underground volatile agents, and a fifth on the 

 origin of the alkaline rocks, were written and sent to press. The 

 spring and summer months were partly occupied by the instruc- 

 tion of the Harvard Reserve Officers Training Corps in topographic 

 mapping. The remainder of the field-season was devoted to 

 special studies in the serpentine area of Quebec and to continued 

 work on the intrusive masses at Mt. Monadnock, Vermont; at 

 Pleasant Mountain and Burnt Meadow mountains, Maine; and 

 near Litchfield, Maine. At the last-mentioned localitv the well- 

 known nephelite syenite, hitherto found only in glacial erratics, 

 was discovered in place, forming dike-like bodies cutting crystal- 

 line schists. 



In April Dr. Harry Clark delivered the deep-sea thermograph 

 noted in last year's report, thus completing his contract. To 

 defray in part the cost of his honorarium and of manufacture, a 

 second grant of seven hundred dollars was made from the Bache 

 Fund of the National Academy of Sciences. The rest of the cost 

 was, with similar generosity, largely met by liberal gifts from 

 Messrs. Rodolphe L. Agassiz, Livingston Davis, and George B. 

 Leighton, members of the Visiting Committee of the Department 

 of Geology and Geography. Endurance and other tests of the 

 instrument have been satisfactorily made by the writer, though 

 no opportunity has yet been given for tests in deep water. 



