Page:Dictionary of National Biography volume 14.djvu/340

 ledged the suggestions which he had received from De Morgan in this respect.

A list of De Morgan's writings is given in Mrs. De Morgan's memoir (pp. 401–15). His separate works are: 1. ‘Elements of Arithmetic,’ 1831 (16th thousand, 1857). 2. ‘Algebra,’ 1835. 3. ‘Connection of Numbers and Magnitude,’ 1836. 4. ‘Essay on Probabilities,’ 1838. 5. ‘First Notions of Logic,’ 1839. 6. ‘Differential and Integral Calculus,’ 1842. 7. ‘Arithmetical Books … from actual inspection,’ 1847. 8. ‘Formal Logic,’ 1847. 9. ‘Trigonometry and Double Algebra,’ 1849. 10. ‘The Book of Almanacs,’ 1850. 11. ‘Syllabus of a proposed System of Logic,’ 1860. He contributed articles to the following between the dates given:—‘Quarterly Journal of Education’ (1831–3), ‘Cambridge Philosophical Transactions’ (1830–68), ‘Philosophical Magazine’ (1835–52), ‘Cambridge Mathematical Journal’ (1841–5), ‘Cambridge and Dublin Mathematical Journal’ (1846–53), ‘Quarterly Journal of Mathematics’ (1857–1858), ‘Central Society of Education’ (1837–1839), ‘The Mathematician’ (1850), ‘British Almanac and Companion’ (1831–57), ‘Smith's Classical Dictionary,’ ‘Dublin Review,’ ‘Encyclopædia Metropolitana’ (including important articles upon the calculus of functions and the theory of probabilities), ‘Penny Cyclopædia.’ Besides these, he wrote prefaces and introductions to many works, including Mrs. De Morgan's ‘From Matter to Spirit’ (1863), obituary notices in the ‘Transactions of the Astronomical Society’ and the ‘Insurance Record,’ and contributed innumerable articles to the ‘Athenæum’ and ‘Notes and Queries.’

[Memoir by (his widow) Sophia Elizabeth De Morgan, 1882; Monthly Notices of Royal Astron. Soc. for February 1872; Stanley Jevons in Encycl. Brit.]  DE MORGAN, CAMPBELL GREIG (1811–1876), surgeon, was born at Clovelly in Devonshire in 1811, the youngest of the three sons of Colonel De Morgan of the Indian army, Augustus [q. v.] being his elder brother. He was educated at University College, London, and afterwards at the Middlesex Hospital. In 1842 he became assistant-surgeon there, and full surgeon on the retirement of Mr. Tuson. In conjunction with Mr. John Tomes he contributed a valuable paper to the Royal Society on the ‘Development of Bone,’ which gained him the fellowship, and was printed in the ‘Philosophical Transactions’ for 1852. He wrote the article ‘Erysipelas’ in Holmes's ‘System of Surgery,’ 1860, and in 1872 a work on the ‘Origin of Cancer.’ This was a subject to which he had paid great attention, having studied it during thirty-four years in the special cancer wards of the Middlesex Hospital. The versatility of his powers was shown by the lectureships he successively held. In 1841 he lectured on forensic medicine; in 1845 he succeeded Mr. Tuson in the chair of anatomy; afterwards he lectured on physiology; and on the retirement of Mr. Shaw became sole lecturer on surgery. In addition to his professional attainments he was a thorough musician, and had considerable artistic taste and ability. Under a somewhat cold manner he possessed great kindness and warmth of heart, and his last act was one of devoted attention to his old friend, Lough the sculptor. After sitting up with him through the night, he returned home in the cold of an early morning and caught a fatal chill. He died on 12 April 1876.

[Lancet, 22 April 1876; private information.]  DEMPSTER, GEORGE (1732–1818), agriculturist, was born in February 1732 at Dundee in Forfarshire, the county in which his grandfather and father had amassed large fortunes by trade, and which Dempster inherited while young. He received his earlier education at the grammar school of Dundee, whence he proceeded to the university of St. Andrews, and completed his scholastic career at Edinburgh, where he became in 1755 a member of the Faculty of Advocates. Entering the best social circles of the city, he was made a member of the ‘Poker Club,’ which had David Hume, William Robertson, and Alexander Carlyle among its supporters. The social intercourse maintained by this club was kept up by the same men in the more numerous body called the ‘Select Society,’ established some years later.

After making the grand tour on the continent, Dempster for a brief period practised at the bar, but being possessed of an ample fortune he abandoned his profession and turned his attention to politics. In 1761 he was elected member of parliament for the Forfar and Fife burghs, after a heated contest, which cost him upwards of 10,000l. He served in parliament for twenty-nine years, and was appointed in 1765 secretary to the Scottish order of the Thistle. He was provost of St. Andrews in 1780. In the House of Commons Dempster supported the Rockingham party, and on the question of the American stamp taxing sided with Fox and Pitt in their opposition to the government. He supported Pitt in his financial plans, particularly in the establishment of the sinking fund. Being elected a director of the East