272 [May, 1S43. 



STATED MEETING, May 23, 1843. 

 Vice President Morton in the Chair. 



DONATIONS TO LIBRARY. 



Mr. Phillips presented upwards of 200 plates of Guerin's 

 " Magasin de Zoologie " in exchange for several duplicate 

 volumes of the Encyclopedie Methodique. 



The Botanical Committee presented a " New Index" to the 

 Herbarium of the Academy; with an index, in addition, to 

 the " Mencke Herbarium," in manuscript. The two col- 

 lections now embrace nearly 3000 genera. 



WRITTEN COMMUNICATIONS. 



An invitation from the American Philosophical Society to 

 attend the celebration of its Centennial Anniversary on the 

 25th inst. 



VERBAL COMMUNICATIONS. 



Dr. Owen exhibited several charts and a large number of 

 very interesting colored drawings, all executed by himself, 

 illustrating the geology of the Western country. These 

 drawings represented all the known fossils characteristic of 

 the various strata of Indiana, Ohio, Illinois, Kentucky, &c, 

 mostly on a magnified scale. Dr. Owen entered into a de- 

 tailed explanation of these drawings, and pointed out the 

 fossils peculiar to each of the formations. 



Professor Rogers followed with some general observations 

 on the geology of the Western States, and also called atten- 

 tion to the remarkable character of the anticlinal axis repre- 

 sented in one of the charts exhibited this evening, which 



