92 bulletin op the 



56th Meeting. November 19, 1813. 



The President in the Chair. 

 The President announced that the meeting was called at this 

 date especially to receive Mr. Alvaa Clark, of Cambridge, Mass. 

 Mr. Clark then gave 



A DETAILED ACCOUNT OF THE CONSTRUCTION OP THE LENSES AND 

 OTHER INTERESTING PORTIONS OF THE LARGE TELESCOPE NOW 

 ESTABLISHED AT THE NAVAL OBSERVATORY. 



The thanks of the Society were voted to Mr. Clark for his com- 

 munication. 



5Tth Meeting. November 26, 1813. 



The President in the Chair. 



The President announced that the meeting had been called 

 this evening especially to listen to a communication from Dr. 

 Bessels of the Polaris Exploring Expedition. After further 

 introductory remarks by the Chair, Dr. Bessels read a paper 



on some op the RESULTS OP THE POLARIS NORTH POLE EXPEDITION. 



{This communication will form a part, of the detailed Report of Dr. Bessels 

 to the National Academy of Sciences.) 



58th Meeting. December 6, 1813. 



The President in the Chair. 

 Mr. J. E. HiLGARD read a communication 



ON THE DETERMINATION OF THE PERSONAL ERRORS IN THE OBSER- 

 VATION OP ASTRONOMICAL TRANSITS, 



illustrating his remarks by the exhibition of apparatus recently 

 constructed for the use of the Coast Survey, 



Mr. J. S. Billings presented a memoir 



ON THE collection OF A LARGE LIBRARY, 



having especial reference to the medical library of the Surgeon- 

 General's Office. 



