245 
DONATIONS. 
Comptes Rendus Hebdomadaires des Séances de  Acade- 
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 Chair. 
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, VY. P., haying 
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 
