son of Dr Humphrey Sibthorp, Professor of Botany at Oxford, and was born in that city in 1758. Being brought up to the medical profession, he prosecuted his studies at Edinburgh, where the taste he had early imbibed for natural history, especially botany, was culti- vated and increased. At the close of his academical course he visited France and Switzerland, and spent a considerable time at Montpelher, where he communicated to the Academy des Sciences of that town an account of his numerous botanical discoveries in the neighbourhood, and was enrolled a member of that society. Having conceived the desire of visiting Greece for the purpose of botanical investigation, he passed part of the year 1784 at Gottingen, and afterwards made the tour of Germany. Proceeding to Vienna, he cultivated the friendship of the principal pro- fessors of his favourite science there, studied with