abstracts of papers 105 



Session of Thursday, December 31 



The Society convened at 9.37 o'clock a. m., with Vice-President H. B. 

 Patton in the chair. 



After sundry announcements by the Secretary, the Society proceeded 

 to the consideration of scientific papers. 



TITLES AND ABSTRACTS OF PAPERS PRESENTED IN GENERAL SESSION AND 



DISCUSSIONS THEREON 



PRESENT CONDITION OF THE VOLCANOES OF SOUTHERN ITALY 



BY H. S. WASHINGTON AND A. L. DAY 



(Alystract) 



A brief description of the general condition and state of activity at Vesuvius, 

 Etna, Vuleano, and Stromholi, as observed during the summer of 1914, 



Presented in full extemporaneously by the senior author. 



RECENT ERUPTIONS OF LASSEN PEAK, CALIFORNIA 

 BY J. S. DILLEB 



(Abstract) 



Lassen Peali, in northeastern California, at the southern end of the Cascade 

 Range, has long been considered an extinct volcano, but has recently shown 

 signs of rejuvenescence. The first of the recent outbreaks occurred at 5 p. m.. 

 May 30, 1914, and since then many eruptions have occurred. The nature of 

 this remarkable phenomenon was illustrated and discussed. 



Eead in full from manuscript. 



Remarks on the paper were made by Messrs. W. J. Miller, .7. S. Diller, 

 and H. B. Patton. 



PHYSIOGRAPHIC STUDY OP THE CRETACEOUS-EOCENE PERIOD IN THE 

 ROCKY MOUNTAIN FRONT AND GREAT PLAINS PROVINCES 



BY GEOBGE H. ASHLEY 



(Abstract) 



The study of the rocks, especially of the cfoal beds, the structure and the 

 life in the provinces iianiod. :ip|»e:irs to indicate that IJpiter Crelafeous time 

 in that region was oi-cupied liy a single movement of sult.sidence, somewhat 

 irregular, but on the whole persistent ; that this was followed by a period 

 of general and differential uplift, to be followed in turn by renewed subsidence, 

 interrupted locally from time to time by i)ronounced movements of differential 

 uplift. Comparison is made between this interpretation and the assumed con- 



