even by his former associates in silence. This determined Priestly to leave England, and in the spring of 1794 he withdrew with his family to America and settled at Northumberland, in Pennsylvania, where he purchased 300 acres of land. Here he remained the rest of his life, occupied in cultivating his land, in occasional preaching, and in scientific studies. He continued writing and publishing until his death, in February 1804, in the 72nd year of his age. He expired very quietly, and so easily that having put his hand to his face those who were sitting close to him did not immediately perceive his death.--_Brougham's Lives of Philosophers._ London and Glasgow, 1855.--_Encyclopædia Britannica._ Eighth Edition. MEMOIRS OF THE DISTINGUISHED MEN OF SCIENCE OF GREAT BRITAIN, LIVING A.D., 1807-8. OPINIONS OF THE PRESS ON THE FIRST EDITION. ONCE A WEEK. Accompanying the picture, &c., there is a volume by Mr. W. Walker, junior, giving a brief memoir of the salient points of each individual history. This is well executed, and forms a useful book of reference for those who would know more than the picture can tell. ENGINEER. Messrs. Walker's great historical engraving of the "Distinguished Men of Science," noticed some weeks ago in these columns, is accompanied by a well written and handsomely printed octavo volume of 228 pages, containing condensed biographical sketches of the fifty-one subjects of the picture itself. The book appears to have been first undertaken with the view of furnishing a mere outline of the life and achievements of these eminent men, but the inevitable delay attending the production of a large engraving, and the gradual accumulation of personal and historical details, at last led Mr. Walker, Jun., to revise and considerably extend the scope of his work, which now forms a very complete and desirable compendium of long-neglected, and, popularly speaking, almost inaccessible biography, of interest and value as well to those who cannot possess themselves of the picture as to the subscribers to that work. The whole is preceded by an introduction, not wanting in suggestive matter, from the pen of Mr. Robert Hunt, F.R.S.... There is probably no work, certainly none so well within the reach of the general public, which gives anything like as full and yet concise an account of the great men of science who lived and flourished half a century ago. The arrangement of the book is such as to facilitate the readiest reference to any part, and, while the matter is abundant, the style is clear and pleasing. We believe the book will be in large request. MECHANICS' MAGAZINE.