PHILOSOPHICAL SOCIETY OF WASHINGTON. 3t 



adjournment arrived, the completion of it was postponed to the 

 next meeting. 



The Society then adjourned. 



161st Meeting. April 26. 1819. 



The President in the Chair. 

 Forty-eight members and visitors present. 

 The minutes of the last meeting were read and adopted. 

 Mr. J. J. Woodward made a communication on 



A NEW APERTOMETER FOR MICROSCOPIC OBJECTIVES. 



Mr. DuTTON continued and completed his communication on 

 the succession of Volcanic Eruptions, reserving his paper for 

 ublication. 



Remarks were made by Messrs. Powell, Elliott, Antisell, 

 Gilbert, Taylor, Farquhar, and Osborne. 



Mr. 0. T. Mason made a communication illustrated by im- 

 pressions of the plates of the lately published works of Dr. 

 Habel on 



THE DECIPHERMENTS OF SOME AZTEC MONUMENTS LATELY 

 DISCOVERED IN GUATEMALA. 



The meeting then adjourned. 



162d Meeting. ]\4ay 10 18*7 9. 



The President in the Chair. 

 Thirty- eight members and visitors present. 

 The minutes of the last meeting were read and adopted. 

 Mr. J. R. Eastman read a communication on 



A personal equation apparatus. 

 42 



