Magalhaens, John Hyacinth De

, said to be a lineal descendant (Mr. Nichols says great-grandson) of the preceding, was born in 1723, and became an Augustine monk at Lisbon, but, having renounced the Roman Catholic religion, came to reside in England, about 1764. He was an able linguist, and well versed in chemistry and other branches of natural philosophy. He published several treatises in that science, particularly a work on mineralogy, taken principally from Crons’tadt; an account of various philosophical instruments; and a narrative of the last days of* Rousseau, to which his name is not affixed. He was elected a fellow of the Royal Society in 1774, and was a member of several foreign academies. He died at his lodgings at Islington, Feb. 7, 1790. ³