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Arnott Hooker's place as botanical lecturer at Glasgow, and in 1845 was appointed professor of botany in that university, leaving Arlary in 1846, and taking up his residence in Glasgow. In 1850 he was associated with Sir William Hooker in the sixth edition of the 'British Flora.' About this time he took up the study of Diatoms, of which he formed a large and valuable collection, publishing several memoirs on the subject. In 1868 his health, which had previously begun to fail, gave way, and the delivery of his university course had to be abandoned. Jaundice set in, and he died on 17 April 1868, and was buried in the Lighthill cemetery, Glasgow, He left three sons and five daughters. His large collections subsequently became the property of the university of Glasgow. He was a good correspondent, an esteemed professor, an accurate observer, and a zealous worker.

[Trans. Bot. Sec. Edinburgh, ix. 414-26.]  ARNOTT, NEIL (1788–1874), physician and natural philosopher, was born at Arbroath, in Scotland, where his father held a valuable farm. His father had become a catholic in early life his mother, Ann, daughter of Maclean of Boteray, was of the same faith. Misfortunes compelled the father to give up his farm and settle first at Blair and afterwards in Aberdeen. Neil was taught by his mother and at the parish school of Lunan, and in November 1798 entered Aberdeen grammar school. In 1801 he was entered as a student in the Marischal College, with a small bursary, where he remained during four sessions, and was especially interested by the lectures of Patrick Copland on natural philosophy. He graduated M.A. in 1805, and at once commenced the study of medicine in Aberdeen. He supported himself partly by acting as shop-assistant to a chemist. In September 1806, he went to London, and became a student at St. George's Hospital, under Sir Everard Home. A year later Home's favour obtained him an appointment as surgeon in the East India Company's service, and he sailed for China in April 1807. During the long and stormy voyage he appears to have made a number of physical and meteorological observations regarding ocean currents, tides, winds, and other atmospheric phenomena, waves, &c., many of which are recorded in his 'Elements of Physics.' He learned languages and gave lectures to the captain and officers. He also turned his attention to sanitary matters, clothing, and ventilation. In 1809, he returned to England, and in the following year made a second voyage to China. He performed a novel operation for stricture, which saved the life of the captain, and devised new modes of ventilating the ship.

On his return to London, in 1811,he commenced practice in Hunter Street, Brunswick Square, in partnership with a friend named Darling, and he soon afterwards began a course of lectures on Natural Science applied to Medicine at the Philomathic Institution, which, in 1827, were published under the title of 'Elements of Physics.' In 1813 he obtained the diploma of the College of Surgeons, and in 1814 the university of Aberdeen conferred upon him the degree of M.D. He continued to practise as a physician till the year 1855, and enjoyed a large and lucrative practice.

Arnott's catholic connections and knowledge of languages helped him in his profession. Many foreigners consulted him. In 1816 he became physician to the French, and some time aftenvards to the Spanish embassy. In the same year he dissolved his partnership with Darling, who had married, and took up his residence in a large house. No. 38 Bedford Square, where he remained to the end of his professional life — more than forty succeeding years. During the next seven or eight years but few changes appear to have taken place in his career.

About 1823 he began to prepare his 'Physics.' Sir David Barry was at this time propagating his views concerning the circulation of blood through the capillary tubes and the veins; and he attributed this to atmospheric pressure. The view was opposed by Dr. Armstrong, who begged Arnott to take up his cause. This led to the delivery of lectures on medical physics in 1825 in Arnott's house. Professor Bain says: 'The lectures made a great impression, and there was a strong desire expressed that he should repeat them.'

The first volume of Arnott's 'Physics' appeared in 1827, and it was received with enthusiasm. A second edition was printed in the same year, a third in 1828, and a fourth, together with Part I. of the second volume, in 1829. In 1833 appeared a fifth edition of the first volume, with a second of vol. ii. Part I. It was speedily translated into Spanish, French, Dutch, and German. The book went out of print, and Arnott spent much time upon a sixth edition, half of which appeared in 1864, and a second half, with new chapters, in 1865; a seventh edition has appeared since his death.

About the year 1855, he gave up his practice, and turned his attention more especially to scientific and sanitary matters. His name