IV 
PAGE 
On the Transmission of the Actinic Rays of Light through 
the Eye, and their relation to the Yellow Spot of the 
Retina. By George Wilson, M.D., . . 371 
Donations to the Library, . . . . 375 
Monday , 21st April 1856. 
On the Prismatic Spectra of the Flames of Compounds 
of Carbon and Hydrogen. By William Swan, Esq., 376 
On the Laws of Structure of the more disturbed Zones of the 
Earth’s Crust. By Professor H. D. Rogers, of the 
United States, . . . . 378 
On a Property of Numbers. By Balfour Stewart, Esq. 
Communicated by Professor Kelland, . . 390 
Analysis of Craigleith Sandstone. By Thomas Bloxam, 
Esq., Assistant-Chemist, Industrial Museum, with a 
Preliminary Note by Professor George Wilson, 390 
Donations to the Library, . . . . 395 
