Ellis, Alexander John

'On clinant geometry, as a means of expressing the general relatings of points on a plane, realising imaginaries, and extending the theories of anharmonic ratios. By Alexander J Ellis, B.A., F.C.P.S. Communicated by Arthur Cayley, Esq. F.R.S. Febr. 1863. Abstract printed in the Proceedings of the Royal Society, vol.12, pp442-3' Carbon copy of MS, with figures drawn in ink. Text and figures on rectos only. Paper wrappers inscribed 'Prof Augustus De Morgan, with the Author’s respects'.

Part of A De Morgan’s library, given to the University by Lord Overstone in 1871. Former shelf-mark L(P.C.6)

Augustus de Morgan was born at Madura, India in 1806. On returning to England, de Morgan was educated at various schools. In February 1823 he entered Trinity College, Cambridge, where he graduated in 1827. In 1828 he was appointed Professor of Mathematics at University College London. De Morgan resigned his post in 1831, on account of a disagreement with the University Council who claimed the right of dismissing a professor without assigning reasons. He resumed his chair in 1836 on assurance that the regulations had been altered so as to preserve the independence of professors, remaining Professor of Mathematics at UCL until he resigned in November 1866.

Open for research. 24 hours notice is required for research visits.

There is an interim handlist to the papers included in MS 238, MS 239, MS 240, MS 241, MS 775 and MS 776, prepared by T D Rogers in 1971. Also see A list of certain letters inserted in books from the Library of Augustus De Morgan (University of London Library, 1990).

1999-09-02 Simon McKeon, 2000-06-07 Sarah Smith

Copies may be made, subject to the condition of the original. Copying must be undertaken by the Palaeography Room staff, who will need a minimum of 24 hours to process requests.

After his death in March 1871, de Morgan's library, which consisted of about three thousand volumes, was bought by Lord Overstone and presented to the University of London. MS 239 was the gift of William Frederick de Morgan in 1908.