314 ANNALS NEW YORK ACADEMY OF SCIENCES 



Edmund Otis Hovey, Notes on the Volcanoes of Toluca, Colima 



AND Popocatepetl. 



Summary of Papers. 



Dr. Hovey said in abstract : Toluca is the oldest of the three volcanoes. 

 A feature of greatest interest in the crater is the dome of vitreous andesite 

 which welled up in the crater as the latest phase of the activity of the volcano 

 and shows a certain resemblance to the cone of Mt. Pele. The volcano of 

 Popocatepetl shows its composite character as a strato-volcano with great 

 clearness in the walls of the crater, and streams of lava have been among 

 the features of the most recent eruptions. 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 character- 

 izes the streams of the earlier eruptions and has led some observers to the 

 erroneous conclusion that flows of lava have not occurred at the volcano of 

 Colima. 



The paper was illustrated with stereopticon views from photographs 

 taken by the author. 



The Section then adjourned to an examination, in an adjoining room, 

 of the exhibits of Geology, Paleontology and Mineralogy in the New York 

 Academy of Sciences' Exhibition, under the guidance of the committeemen 

 in charge of those exliibits. 



A. A. JULIEN, 



Secretary. 



SECTION OF ASTRONOMY, PHYSICS AND CHEIMISTRY. 



January 21, 1907. 



Section met at 8:15 P. M., Vice-President Trowbridge presiding. Wil- 

 liam Campbell was appointed Secretary of Section pro tern. 



The minutes of the last meeting of the Section were read and approved. 

 The following program was then offered : 



William Campbell, The Relation between the Microstructure and 



the Heat and Mechanical Treatment of Iron 

 and Steel. 



