1864.] 425 ["Toriicelli " 



ceived from the New York State Library at Albany, Sep- 

 tember 21st. 



Donations for the Library were received from Professor 

 Zantedeschi, of Padua ; the London Meteorological, Geologi- 

 cal, and Antiquarian Societies ; the Essex Institute ; the New 

 York State Library ; the Loyal Publishing Association ; the 

 Protestant Episcopal Convention of Pennsylvania ; the Hon. 

 William Duane and Reverdy Johnson ; the Franklin Insti- 

 tute, and the College of Physicians of Philadelphia. 



A donation for the Cabinet was received, through Mr. 

 Chase, from Mr. W. K. Lanphear, of Cincinnati, consisting 

 of 315 trade tokens. 



The photograph of Professor J. C. Cresson was presented 

 for the Album. 



A communication offered for the Magellanic Premium, ad- 

 dressed to the President and signed " Torricelli," was read by 

 Secretary Dr. Le Conte, and referred, as the By-Laws direct, 

 to the Board of Officers. 



The communication announces "the discovery of certain new re- 

 lations between the solar and lunar diurnal variations of magnetic 

 force, and of barometric pressure." 



These relations may be expressed by the proportions : 



B' : B" : : ^M M' : v/A" M" (1) 



B' : M' : : A' : A" (2) 



B" : M" : : B' : B" (3) 



A', A.", representing the tidal force of the sun and moon, re- 

 spectively. 



B', B" the diurnal barometric variation. 



M', M", the diurnal magnetic variation. 



Proportion (1) is readily deduced from (2) and (3). 



Pending nominations Nos. 525, 526, 527, 528, were read. 



The Committee upon the Purchase of a Site for the Hall, 

 reported as follows : 



" That they have received notice from 3Ir. Harrison that he has 

 another applicant for the lot, and that he is now willing to sell. 

 His price is 816,000, which may be in a reserved ground rent, re- 



VOL. IX. — 3e 



