⁂ This new and uniform edition of the Writings of Sir Humphry Davy embraces the whole of his Works during the space of thirty years (1799 to 1829), a period memorable in the History of Chemistry, and made so, in no small degree, by his own discoveries.

ILLUSTRATED WORKS ON NATURAL HISTORY BY CAPTAIN THOMAS BROWN.

ILLUSTRATIONS OF THE RECENT CONCHOLOGY OF GREAT BRITAIN AND IRELAND.

With the Description and Localities of all the Species,—Marine, Land, and Fresh Water. Drawn and Coloured from Nature, by Captain Thomas Brown, F.L.S., M.W.S., M.K.S., Member of the Manchester Geological Society. In one vol. royal 4to., illustrated with fifty-nine beautifully coloured Plates, price 63s. cloth.

ILLUSTRATIONS OF THE FOSSIL CONCHOLOGY OF GREAT BRITAIN AND IRELAND.

By Captain Thomas Brown, F.L.S. To be completed in about Thirty Numbers, each containing four Plates. Royal 4to., price 3s. coloured, and 2s. plain. Twenty-eight Numbers have appeared, and the work will soon be completed.

ILLUSTRATIONS OF THE GENERA OF BIRDS.

Embracing their Generic Characters, with Sketches of their Habits. By Captain Thomas Brown, F.L.S. Now publishing in Numbers, royal 4to., each containing four Plates, price 3s. coloured.

THE ELEMENTS OF FOSSIL CONCHOLOGY;