C Vi ^ 
XXL Observations on the temperature of the ocean and atmo- 
sphere, and on the density of sea-water, made during a voyage 
to Ceylon. In a Letter to Sir Humphry Davy, LL. D. 
F. R. S. By John Davy, M . D. F. R. S. - 275 
XXII. Observations on the genus Ocythoe of Rafinesque, with a 
description of a new species. By William Elford Leach, 
M.D.F.R.S. - 293 
XXIII. The distinguishing characters between the ova of the 
Sepia, and those of the vermes testacea, that live in water, 
explained. By Sir Everard Home, Bart. V. P. R. S. 297 
XXIV. Astronomical observations and experiments tending to 
investigate the local arrangement of the celestial bodies in space, 
and to determine the extent and condition of the Milky W ay. 
By Sir William Herschel, Knt. Guelp. LL. D. F. R. S. 302 
XXV. Some account of the nests of the Java swallow, and of 
the glands that secrete the mucus of which they are composed. 
By Sir Everard Home, Bart. V. P. R. S. 332 
XXVI. Observations on the Hirudo complanata, and Hirudo 
stagnalis , now formed into a distinct genus under the name, 
Glossopora. By Dr. Johnson, of Bristol. Communicated 
by Sir Everard Home, Bart. V. P. R. S. - 339 
XXVII. Observations on the gastric glands of the human sto- 
mach , and the contraction which takes place in that viscus. 
By Sir Everard Home, Bart. V P. R. S. - 347 
XXVIII. On the parallax of the fixed stars . By John Pond, 
Esq. Astronomer Royal. - 953 
Presents received by the Royal Society from November 181 6 to 
July 1817 - 363 
Index 
