OP ARTS AND SCIENCES. 611 



shall Islands. Between these islands and the Hawaiian Islands, 

 and between the latter and San Francisco, a distance of four 

 thousand miles, a line of deep-sea dredgings will be run, deep-sea 

 tow-nets being used while the dredging is going on. The 

 Albatross is expected to return to the United States in April 

 next. 



The following papers were presented by title : — 



The Development and Application of a General Equation for 

 Free Energy and Physico-chemical Equilibrium. By Gilbert 

 Newton Lewis. Presented by T. W. Richards. 



The Electro-chemical Equivalents of Copper and Silver. By 

 T. W. Richards, E. Collins, and G. W. Heimrod. 



A Revision of the Atomic Weight of Calcium. By T. W. 

 Richards. 



Short Studies of North American Tryxalinae. By Samuel 

 H. Scudder. 



The Recording Secretary read the agreement with the Mas- 

 sachusetts Historical Society in regard to quarters for the 

 Academy in the new building of the Society. Remarks on this 

 subject were made by the President and Augustus Lowell. 



Nine hundred and tenth Meeting. 



October 11, 1899. — Stated Meeting. 



The Academy met at Ellis Hall. 



Vice-President Hyatt in the chair. 



The Corresponding Secretary read letters from Henry Lefa- 

 vour, accepting Fellowship in the Academy ; from the Royal 

 Academy of Sciences of Turin, announcing the death of Pro- 

 fessor Cesare Nani ; from the National Society of Horticulture 

 of France, announcing the death of its first Vice-President, 

 Henri Le'veque de Vilmorin ; from the Students' Union at the 

 Polytechnic School at Zurich, inviting attendance at the 

 twenty-fifth jubilee of Professor A. Heim ; from Captain Con- 

 stantin Edler von Pott, announcing his appointment as Director 

 of the Hydrographic Bureau of the Imperial and Royal Navy 

 at Pola ; and from Charles R. Lanman, reporting his inability 



