VOLCANOES OF COLIMA, TOLUCA, AND POPOCATEPETL 635 



The next paper was 



VOLCANOES OF COLIMA, TOLVCA, AND POPOCATEPETL 

 BY EDMUND OTIS HOVEY 



[Al)stract\ 



The principal object of presenting the paper was to sliow the Society some 

 photographs of these three volcanoes which \\qvq taken upon excursions made 

 in connection with the meeting of the Tenth International Geological Congress 

 in the city of Mexico, in September, 1906. 



Toluca is the oldest of the three. A feature of greatest interest in the 

 crater is the dome of viti-eous andesite which welled up iu the crater as the 

 latest phase of the activity of the volcano and shows a certain resemblance to 

 the new cone of mount Pelee. The volcano of Popocatepetl shows its composite 

 character as a strato-volcano with great clearness iu the walls of the crater, 

 and streams of lava have been among the features of the most recent erup- 

 tions. The volcano of Colima is still sending up a vigorous column of steam 

 from its central summit crater. From this summit crater there poured out, 

 in the latest eruption (1903), streams of very frothy lava, which present a 

 strange appearance on account of the porous character of the surface blocks. 

 The same feature characterizes the streams of earlier eruptions and has led 

 some observers to the erroneous conclusion that flows of lava have not 

 occurred at the volcano of Colima. 



Remarks were made by A. HeiljDrin and the author. 

 The next paper was 



GEOLOGICAL STRUCTURE OF THE UINTA MOUNTAINS 

 BY S. F. EMMONS 



Eemarks were made by C. P. Berkey. This paper forms pages 287-303 

 of this volume. 



The following paper was read by title : 



STRATIGRAPHY AND STRUCTURE OF THE UINTA RANGE 

 BY F. B. WEEKS 



This paper has been printed as pages 427-44:8 of this volume. 

 The next paper was 



STRUCTURE OF THE FRANKLIN MOUNTAINS, TEXAS 

 BY G. B. RICHARDSON* 



The paper was discussed by W. M. Davis. 



* Introduced by C. W. Hayes. 



