Leeuwenhoek was one of the first and also one of the greatest of the microbiologists. Many of his discoveries were communicated by him to the Royal Society in London, and this set is a collection in Dutch of many contributions sent by van Leeuwenhoek to the Royal Society, and first published in English translation in Philosophical Transactions. He was first to describe spermatozoa, and the red blood corpuscles, discovered the crystalline lens, and was the first to see protozoa under the microscope. He introduced staining in histology in 1719 (saffron for muscle fibres). He discovered protozoa and bacteria. He is said to have had 250 microscopes and 419 lenses, many of them ground by himself. (See also Nos. 98, 265, 860.) An English translation of his works omitting all references to spermatozoa appeared in 2 vols, in 1798-1807. Clifford Dobell’s study, Antony van Leeuwenhoek and his ‘little animals “ London, 1932, revealed many new facts about the man, and included a bibliography.