[ V ] 
XX. Spectroscopic Observations of the Sun. By J. Norman Lockyer, F.R.S., and 
G. M. Seabroke, F.R.A.S. page 577 
XXI. Tables of Temperatures of the Sea at different Depths beneath the Surface, 
reduced and collated from the various observations made between the years 1749 
and 1868, discussed. With Map and Sections. By Joseph Prestwich, M.A., 
F.B.S., F.G.S. 587 
675 
XXII. A Memoir on Prepotentials. By Professor Cayley, F.B.S. 
Index .... 
775 
