277 



Map of the Harbour of Annapolis. Founded upon a Trigonometrical 

 Survey, under the Direction of A. D. Bache, Superintendent of 

 the Survey of the Coast of the United States, &c. &c. &c. — From 

 the Treasury Department. 



Map of the Harbour of New Bedford. Founded upon a Trigonome- 

 trical Survey, under the Direction of A. D. Bache, Superintendent 

 of the Survey of the Coast of the United States, &c. &c. &c. — 

 From the same. 



ADDITIONS TO THE LIBRARY BY PURCHASE. 



Anoales de Chimie et de Physique. Troisieme Serie. Juin, 1846. 

 Tome XVII. 8vo. 



Comptes Rendus Hebdomadaires des Seances de I'Academie des Sci- 

 ences. Par MM. les Secretaires Perpetuels. Tome XXII. Nos. 

 17 a 21. 27 Avril au 25 Mai, 1846. 4to. 



Astronomische Nachrichten. Nos. 557, 558, 559. Title and Index 

 to Vol. XXIII. 4to. 



Mr. Ord announced the death of Mr. Samuel Humphreys, 

 U. S. Naval Constructor, and a member of this Society. He 

 died at Washington, D. C, on the 16th inst, at the age of 68. 

 On motion of Mr. Ord, Mr. Lenthall w^as requested to prepare 

 an obituary notice of the deceased. 



Mr. Justice alluded to the manufacture of large disks of glass 

 for optical purposes, by Mons. Bouthovvare, of Paris, and re- 

 marked that he had seen one free from all imperfection. Glass 

 for optical uses is now ground at New York, by Mr. Fitch. 



Dr. Patterson inquired whether a companion star to Anlares 

 had been observed at the High School Observatory; and re- 

 marked that Prof. Mitchell, of Cincinnati, had discovered such 

 a star, whose existence had not before been suspected. The 

 same had been also observed by Lieut. Maury and Mr. Walker, 

 at Washington; and while making the observation, Lieut. 

 Maury had observed a second star: but from a communication 

 from Mr. Walker, it seemed probable that this might be an 

 optical illusion. Mr. Justice stated that large glasses were 

 often the source of deception. 



In continuing this conversation. Dr. Bache observed that 

 Prof. Airy had found great difficulty in procuring glass for the 



