'Catalogus,' arranged, not alphabetically,
bat in accordance with Ray's own system,
which Martyn employed through life. He
continued to live in London, practising
from 1727 to 1730 in Great St. Helen's,
Bishopsgate, apparently as an apothecary,
and lecturing both on botany and on materia
medica. In 1728 he issued the first decade
of his most magnificent work, ' Historia
plantarum rariorum,' an imperial folio, with
mezzotint plates by Kirkall, printed in
colours, after Van Huysum; but, though by
1737 four more decades had been issued, the
work had then to be discontinued for want
of support.
In conjunction with Dr. Alexander Russel [q. v.] Martyn in 1730 started the well-known Thursday miscellany called 'The Grub Street Journal,' using himself the signature 'Bavius,' while Russel wrote as 'Mævius.' It survived until 1737, when two volumes of selections were published as 'Memoirs of the Society of Grub Street' (see Elwin, Pope, viii. 268).
Meanwhile, at Sloane's advice, he in 1730 entered Emmanuel College, Cambridge, and kept five terms, but his practice and his marriage prevented his graduating, and the title M.D. was appended to some of his papers in the ' Philosophical Transactions' merely by mistake. On the death of Bradley, in 1732, Martyn was elected professor of botany at Cambridge, in spite of attempts, probably based on his friendship with the Jacobite Blair, to discredit him as a nonjuror. His lectures, however, met with little encouragement : he felt the want of a botanical garden ; and from 1735 he ceased to lecture. In 1732 he entered into an agreement with the booksellers for an abridgment of the 'Philosophical Transactions,' and he accordingly published iive volumes between 1734 and 1756, comprising the 'Transactions' from 1719 to 1750. On the death of Dr. Rutty, however, he was unsuccessful in his candidature for the secretaryship of the Royal Society, the successful competitor, Dr. Cromwell Mortimer, being a relative of Sloane.
About 1737 Martyn received from Linnaeus a copy of his ' Flora Lapponica,' published in that year, and thus began a correspondence between them. Reference is made to this work by Martyn in the first volume of the last great literary undertaking of his life — an edition, with translation and natural history notes, of the works of Virgil. Of this he published the 'Georgicks' in 1741, the astronomical matters being revised by his friend Edmund Halley [q. v.], and the 'Bucolicks' in 1749 ; but only left some dissertations and notes on the 'Æneid,' which were issued posthumously.
Since 1730 Martyn lived when in London in Church Street, Chelsea, where he continued to practise medicine. In 1752 he retired from practice to Hill House, a farm on Streatham Common, and in 1762 he resigned his professorship. On his son Thomas (1735-1825) [q. v.] being elected in his place he presented to the university some two hundred botanical works, his /tortus siccus of 2,600 foreign specimens, his drawings of fungi, and his collections of seeds and materia medica. He suffered from gout in the head and stomach, and was thus unable to enjoy his farm. He accordingly returned to Chelsea about 1767, and there he died 29 Jan. 1768. He was buried on the north side of Chelsea churchyard. Martyn married in 1732 Eulalia, daughter of John King, D.D., rector of Chelsea and prebendary of York, by whom he had three sons and five daughters, four of the latter dying young. His first wife died in 1749 of cancer in the breast caused by a blow received in the street. He married secondly, in 1750, Mary Anne, daughter of Claude Fonnereau, merchant, of London, by whom he had one son, Claudius, who became rector of Ludgershall, Buckinghamshire, and died in 1828.
Among Martyn's chief botanical correspondents were Blair, Philip Miller, Dr. Richardson (of North Bierley, Yorkshire), Sloane, Houstoun, Blackstone, Collinson, Boerhaave, Bernard de Jussieu, and Linnaeus. Some of his letters, given by his son to Sir Joseph Banks, are preserved in the botanical department of the British Museum.
Martyn introduced valerian, peppermint-water, and black currants into pharmacy, and, in addition to his published writings, made careful studies of history and modern languages, and collected material for an English dictionary, so that Pulteney may well style him ' indefatigable ' (Sketches of the Progress of Botany, ii. 215). His friend Dr. Houstoun dedicated to him the bignoniaceous genus Martynia. Of thirteen papers contributed by him to the ' Philosophical Transactions,' one describes a journey to the Peak, another a well-boring yielding purgative water at Dulwich, and several refer to observations of the aurora and of an earthquake experienced at Chelsea in 1749-50.
Besides the works mentioned above, Martyn wrote: 1. 'Tabulæ synopticæ Plantarum officinalium ad Methodum Raianam dispositte,' London, 1726, fol. 2. 'Treatise on the Powers of Medicines,' by Boerhaave, translated, London, 1740, 8vo. S. Transla-
