OLOF, a celebrated Swedish botanist, was born at Norrköping in East Gothland in 1760. He commenced his studies in Upsal, and began early to make excursions through various districts of Sweden in quest of botanical specimens. He made a voyage to America in 1783, and returned to England in 1788, on his way home. After staying about a year, diligently examining whatever was of note in regard to his favourite study in Britain, he returned to Sweden in 1789, and was made professor of natural history in the medical school of Stockholm. He published his first work on mosses at Erlangen in 1799. We can only signalize his works, which were as follows:—Nora Genera et Species Plantarum, 1788; Observationes Botanicae, 1791; Icones Plantarum Incoognitarum, 1794-1800; Flora India Occidentalis, 1806; Synopsis Fiticum, 1806; Summa Vegetabilium Scandinavice Systematice co-ordinatorum, 1814. Besides writing from the 5th to the 8th volume of the Svensk Botanik, a national work on Swedish botany, he also contributed numerous papers to the Philosophical Transactions, and to the Transactions of the Linnean Society of London. He added some 50 genera and 850 species to the list of flowering plants, and a great number to the class of cryptogamia. He died in 1818.