CONTENTS. 
XII. On the specific gravity, and temperature of Sea Waters, in 
different parts of the Ocean, and in particular seas ; with some 
account of their saline contents. By Alexander Marcet, M.D. 
F. R. S. &c. p. 161 
XIII. An account of the fossil skeleton of the Proteo-saurus. 
By Sir Everard Home, Bart. V. P. R. S. p. 209 
XIV. Reasons for giving the name Proteo-saurus to the fossil 
skeleton which has been described. By Sir Everard Home, 
Bart. V. P. R. S. 212 
XV. Some Observations on the peculiarity of the Tides between 
Fairleigh and the North Foreland ; with an explanation of 
the supposed meeting of the Tides near Dungeness. By James 
Anderson, Captain in the Royal Navy. Communicatedby the 
Right Hon. Sir Joseph Banks, Bart. G. C. B. P. R. S. p. 217 
XVI. On the Ova of the different tribes of Opossum and Orni- 
thorhynchus. By Sir Everard Home, Bart. V. P. R . S. p. 234 
XVII. The results of Observations made at the Observatory of 
Trinity College, Dublin, for determining the Obliquity of the 
Ecliptic, and the Maximum of the Aberration of Light. By the 
Rev. J. Brinkley, D. D. F. R. S. and M. R. I. A. and An- 
drew’s Professor of Astronomy in the University of Dublin. 
p. 241 
XVIII. On some new Methods of investigating the Sums of 
several Classes of infinite Series. By Charles Babbage, Esq. 
A. M. F. R. S. p. 249 
