Respecting the Natural History, it may be expedient to remind the reader, that in the last edition of Chambers’s Encyclopædia, four volumes of the largest size, with one volume of plates, printed in 1783, the very word Geology does not occur; and that some years later, chemical lectures were publicly given on the phlogistic theory of Becher and Stahl. Mr. POLWHELE has published in seven parts, beginning with the date 1803, and ending with that of 1816, making in all two quarto volumes, of about 1200 pages, in small type, and abounding with notes and extracts in a type still smaller, an immense collection of matter relative to the antiquities, the biography, the literature, the history military and civil, &c. of Cornwall; arranged under distinct heads, and enriched with prints of distinguished persons, with figures of ancient castles, churches, monuments, &c. and with views of towns, and of romantic scenery. One is astonished at the great labour bestowed on this work, and still more so when it is recollected, that the author has distinguished himself in every branch of elegant literature, and most of all in that department, where the fire of genius is believed somewhat to diminish the aptitude for patient toil. The next work on Cornwall deserves particular attention on various grounds,――its extensive plan, arrangement, and parochial history, and the situation in life of its author, Mr. C. S. GILBERT, who at the time of his executing “An Historical Survey of the County of Cornwall; to which is added a complete Heraldry of the same, with numerous engravings,” resided as a druggist in Plymouth or Devonport; and he is said to have acquired a knowledge of this trade by accompanying one of those itinerant doctors in medicine, who are in the habit of attracting customers by exhibitions little suited to the gravity of a profound science. Mr. Gilbert is understood to have collected information which induced him to believe, that he might claim a descent from the Gilberts of Compton Castle; and under that persuasion he applied himself to the study of antiquities, with genealogy, heraldry, and every collateral science, which led him by degrees to undertake the History of Cornwall, and to complete it in two quarto volumes, usually bound in three; all which he executed with such eagerness, zeal, and disregard of expense, as to involve him during the latter part of his life in considerable difficulties. For Compton Castle, and the family from which this gentleman thought himself derived, and which is now represented by the Reverend J. Pomeroy Gilbert, of Bodmin, see Prince’s Worthies of Devon, p. 420, edition of 1810.