CONTENTS. 
Upon the Extent of the Expansion and Contraction of Timber 
in different Directions relative to the Position of the Medulla 
of the Tree. .. ye bi. Se ss aa ee 
On the Nautical Almanac for 1820... oe eee, POU 
Prospectus of a new System of Beaconing. ..  .. 433 
Notices respecting New Books. 65, 130, 224, 297, 379, 449 
Proceedings of Learned Societies. 69, 146, 220, 293, 375, 456 
Intelligence and Miscellaneous Articles. 73, 143, 230, 307, 386, 
458 
List of Patents. .. it 76, 154, 235, 317, 391, 466 
Meteorological Tabves, 77—80, 157—160, 237—240, 319— 
320, 395—400, 470—473 
THE 
