PHILOSOPHICAL SOCIETY OF WASHINGTON. 113 



Mr. S. Newcomb read a paper on 



THE COSMOGONY; 



reviewing the various speculations on the development of the 

 solar system, especially those of Kant, La Place, and Herschel ; 

 referring also to the latter's examination of nebulae. 



A discussion followed in which Messrs. Powell, Taylor, An- 

 TisELL, Newcomb, E. B. Elliott, Marsh, and Henry parti- 

 cipated. 



121sT Meeting. March 24, 1877. 



The President in the Chair. 



Fifty-six members and visitors present. 



The election of Mr. Montgomery Meigs as a member of the 

 Society was announced. 



Mr. G. K. Gilbert continued his communication on 



the henry mountains, 



describing their geological formation, and particularly the peculiar 

 volcanic structure in some localities, where the lava did not reach 

 the surface, but was injected between strata and caused a bulging 

 of those lying above. 



( This paper will appear in the Reports of the U. S. Geographical and 

 Geological Survey of the Rocky Mountain Region.) 



Mr. Powell spoke of other peculiarities of these mountains. 



Mr. T. N. Gill made a communication on 

 the relations and sequences of the family centrarchoides. 



Remarks were made by Mr. Hilgard and Prof. D. S. Jordan 

 of Butler University, Indianapolis. 



Mr. Marcus Baker read the following paper on 



THE HISTORY OF MALPATTl'S PROBLEM. 



