£ iv 1 
XXL A description of the teeth of the Delphinus Gangeticus. 
By Sir Everard Home, Bart. V. P. R. S. p. 417 
XXII. Description of an acid principle prepared from the lithic 
or uric acid. By William Prout, M. D. Communicated by 
W. H. Wollaston, M. D. F. R. S. p. 420 
XXIII. Astronomical observations and experiments , selected for 
the purpose of ascertaining the relative distances of clusters of 
stars, and of investigating how far the power of our telescopes 
may be expected to reach into space, when directed to ambiguous 
celestial objects. By Sir William Herschel, Knt. Guelp. 
LL.D.F.R.S. p.429 
XXIV. On the structure of the poisonous fangs of serpents. By 
Thomas Smith, Esq. F. R. S. p. 471 
XXV. On the parallax of a. Aquilce. By John Pond, F. R. S. 
Astronomer Roytfl. p. 477 
XXVI. On the parallax of the fixed stars in right ascension. By 
John Pond, F. R. S. Astronomer Royal. p. 481 
XXVII. An abstract of the results deduced from the measurement 
of an arc on the meridian, extending from latitude 8° 9' 38", 4, to 
latitude i8°3' 23 n ,6, N. being an amplitude of 9 0 53' 45", 2. 
By Lieut. Colonel William Lambton, F. R. S. 33d Regiment 
of foot. p. 486 
Presents received by the Royal Society, from November 1817 to 
June 1818. p. 519 
Index. p. 528 
