CONTENTS. 
Yorkshire, in the year 1821 : with a comparative view of five 
similar caverns in various parts of England, and others on 
the Continent. By the Rev. William Buckland, F. R. S. 
F. L. S. Vice President of the Geological Society of London , 
and Professor of Mineralogy and Geology in the University of 
Oxford, &c. &c. &c. - - - - 171 
XVII. Communication of a curious appearance lately observed upon 
the Moon. By the Rev. Fearon Fallows. In a Letter ad- 
dressed to John Barrow, Esq. F. R. S. - - 237 
XVIII. On the difference in the appearance of the teeth and 
the shape of the skull in different species of Seals. By Sir 
Everard Home, Bart. V. P. R. S. - - 239 
APPENDIX. 
Meteorological Journal kept at the Apartments of the Royal 
Society, by Order of the President and Council. 
