245 



DONATIONS. 



Comptes Rendus Hebdomadaires des Seances de VAcade- 

 mie des Sciences. Par MM. les Secretaires Perpetuels. 

 Second Semestre. No. 19, 20. Presented by the Academy. 



Statement of the Receipts and Payments of the Royal 

 Society, between Nov. 29th, 1837, and Nov. 29th, 1838. Pre- 

 sented by the Society. 



Two Papyri, brought from Thebes in Upper Egypt, by 

 George James Knox, Esq. Presented by Mr. Knox. 



January 14, 1839. 



SIR Wm. R. HAMILTON, A. M., President, in the Cbair. 



Major Henry D. Jones ; Charles E. H. Orpen, M. D. ; 

 Thomas Andrews, M. D. ; P. M. Murphy, Esq. ; Rev. James 

 Wills; Richard Palmer Williams, Esq. ; and Thomas Grubb, 

 Esq., were elected Members. 



His Grace, the Archbishop of Dublin, V. P., having 

 taken the Chair pro tempore, the President communicated 

 to the Academy the first part of his researches on the 

 Dynamics of Light. 



William Bald, Esq., Civil Engineer, read a paper en- 

 titled " An Account of the Survey and Map of the County 

 of Mayo." 



The author commenced by giving a brief account of the 

 origin and progress of the construction of topographical maps 

 in Europe. In modern times, the first attempt at the con- 

 struction of topographical maps may be dated from the se- 

 venteenth century, and was due to the Swedes. Under Charles 

 the Ninth, a surveying department was organized, placed 



