DANIEL, an English geologist, was born in London in 1806. His mother, who died shortly after his birth, was a sister of the poet Rogers. He was educated at Walthamstow, and showed early a predilection for the study of natural science. He became a member of the Geological Society in June 1829, and read a short memoir the following year on a fine specimen of Ichthyosaurus, from the las of Stratford-on-Avon. It turned out that this species of reptile had previously been noticed by Conybeare. During the next twenty years Sharp's attention was much directed to the geology of Lisbon and Oporto, and during these years he read numerous papers before the Geological Society. He had been led thither by his profession of a wine-merchant, and it was to his labours that the society owes the greater part of its knowledge of the geological structure of the district of the Tagus. He examined the relations of the earthquake of 1755 to the geological structure of the site of Lisbon, and found that while all the buildings occupying the tertiary strata had been demolished, those situated on the hippurite limestone and basalt had entirely escaped. In 1848 he gave a detailed account of the coal deposits of Vallongo, in Portugal, and inclined to the opinion that this substance was really of the Silurian age. Next year he combined a general sketch of the geology of Portugal, with a notice of the structure of the district north of the Tagus; and as this necessitated great labour, he gained the assistance of various scientific friends. He was enabled, by his critical examination of organic remains, to present a lucid paper on the comparison of the North American formations with those of Europe in 1847. He reviewed the classifications of Belgium and England in 1852, of South Westmoreland in 1842 and 1843, of the Bala Limestone in 1842, and of North Wales in 1846. Sharp likewise collected many papers, and devoted much thought and labour to the subject of slaty cleavage, on which he read his first memoir in 1846. He engaged in an investigation of the geology of the Highlands of Scotland with Greenough, with the design of constructing a new geological map of Scotland for the Geological Society of London. The account of his labours on this district will be found in the Philosophical Transactions for 1852. He likewise wrote a paper on the Farrington gravels in 1853, which bespeaks his palaeontological industry. His elaborate essays on the ancient coins and inscriptions of Lydia, appended to the works of Fellows, Forbes, and Spratt, display in an eminent degree his knowledge of philology and ethnology. He was Fellow of the Royal Linnean, and Zoological Societies, and occupied at the time of his death, which happened on the 31st of May 1856 (occasioned by a fall from his horse), the post of President of the Royal Geological Society, to which so much of his labour and so large a portion of his time had been devoted for more than a quarter of a century.