4. OUTLINES of an Attempt to establish a Knowledge of ExTRANEOUS FOSSILS on Scientific Principles. By WILLIAM MARTIN, F.L.S. &c. In Octavo, 8s. in boards.

5. SPECIMENS of BRITISH MINERALS, selected from the Catnet of PHILIP RASHLEIGH, Esq. of Menabilly, F.R.S. and F.A.S. With general Descriptions of each Article. In two parts quarto, with coloured Engraving, price Four Guineas in boards.

6. BRITISH MINERALOGY, in Coloured Figures with Descriptions from the Primitive Crystals to their Amorphous States. By JAMES SOWERBY. No. 1 to 68. royal 8vo. 131. 5s. Od. To be caatinued in Numbers published every other month, price 51. each.

7. By the same Author. EXOTIC MINERALOGY, or Coloured Figures of Foreign Minerals, as a Supplement to British MineralogyNos. 1, 2, 3. 15s. To be continued every other month in Five-shilling Numbers.