OF ARTS AND SCIENCES. 309 



Mr. W. A. Rogers presented a communication " On the 

 Origin and Cause of Periodic Errors in the Observed Right 

 Ascension of Stars." 



Mr. S. H. Scudder read the memorial presented at the 

 last meeting as corrected by the committee to whom it 

 was referred. 



It was voted to authorize the President to sign this memo- 

 rial and present it to the General Court. 



Dr. E. H. Clarke addressed the meeting on the action 

 of the Mayor of Boston with regard to the establishment of a 

 Public Park. 



It was voted to appoint a committee to consider whether it 

 was advisable for the Academy to take action in this matter, 

 and if so to prepare a proper memorial. 



Remarks on this subject were made by Messrs. E. H. Clarke, 

 G. B. Emerson, A. P. Peabody, A. Agassiz, and W. Everett. 



The President appointed Messrs. Clarke, Emerson, and 

 Lowell to serve on this committee. 



Six hundred and sixty-ninth Meeting. 



May 12, 1874. — Monthly Meeting. 



The President in the chair. 



Professor Peirce presented a communication on Ocean 

 Lanes for Steamships. 



It was voted to appoint a committee for the purpose of 

 inducing the adoption of such routes. 



The following gentlemen were appointed members of this 

 committee : Messrs. C. F. Adams, G. T. Bigelow, J. I. Bow- 

 ditch, J. H. Clifford, and H. H. Hunnewell. 



Professor E. C. Pickering presented a communication on a 

 modification of the Graphical Method. 



Mr. S. P. Sharpies exhibited a piece of tin, showing marked 

 corrosive action produced by water, and made a communi- 

 cation on this subject. 



Mr. S. H. Scudder stated that the Memorial for a Gelogical 

 Survey had been presented to the Legislature, and referred 

 by them to the Board of Education. 



