xxxviii Trans. Acad. Sci. of St. Louis. 



volcanic explosions have produced such ether waves, which 

 have been simultaneously recorded over the continents of 

 Europe and America. 



April 20, 1903. 



President Eliot in the chair, twenty-two persons present. 



Professor J. A. Holmes gave an account of some of the 

 efforts that are being made in the United States to preserve 

 the forests and other natural features of the country, show- 

 ing what is being done for the preservation of some of the 

 great scenic features and particularly what the National Gov- 

 ernment is doing in the establishment of national parks and 

 forest reserves, and in the protection of their forests. The 

 lecture was illustrated by a series of lantern slides. 



Dr. Alexander N. De Menil was elected to active member- 

 ship. 



May 4, 1903. 



President Eliot in the chair, thirteen persons present. 



Mr. H. A. Wheeler gave an account, illustrated by several 

 lantern slides and some of the ejected material, of the active 

 Mexican volcano Colima, in which it was shown that the 

 material now being ejected is a trachyte or belongs to the acid 

 series of lavas, while the basal plain of the volcano is basalt, 

 which is basic, and resting on volcanic tufa. It was pointed 

 out that this sequence reverses the Richtopen order, from which 

 it was considered probable that there had been other centers 

 of lava outflow besides the now visible vents of Mt. Colima 

 (active) and Mt. Zapotlan (inactive). Samples of the ash 

 from the eruption of February 28, collected at Tuxpan, some 

 25 miles from the crater, by Prof. Trelease, contained 62.5% 

 silica, according to the analysis of Wm. M. Chauvenet. 



Mr. Trelease, who had been near the base of the mountain 

 during its recent activity, made a few remarks in connection 

 with the paper. 



The following amendments to the By-Laws, recommended 



