COMMITTEE. Chairman-The Right Hon. LORD BROUGHAM, F.R.S., Memb. Nat. Inst. of France. W. Allen, Esq., F.R. & R.A.S. T. Drummond, Esq., R.E., Rowland Hill, Esq., F.R.A.S. F.R.A.S. Capt. F. Beaufort, R.N., F.R., Sir C. Bell, F.R.S.L. & E. J. B. Carter, Esq. M.P. J. Fred. Daniell, Esq., F.R.S. ton, M.P. T. F. Ellis, Esq., A.M., F.R.A.S. of John Elliotson, M.D., F.R.S. H. T. De la Beche, Esq., V.P. Edwin Hill, Esq. The Right Hon. Sir J. C. Hob- The Rt. Hon. the Earl of Kerry, M.P. Thos. Hewitt Key, Esq., M.A. I. L. Goldsmid, Esq., F.R. and James R.A.S. F.G.S. B. Gompertz, Esq., F.R. and George Long, Esq., M.A. R.A.S. G. B. Greenough, Esq., F.R. & R.A., and L.S.S. H. Malden, Esq., M.A. F.R., THOMAS COATES, Esq., Secretary, 59, Lincoln's Inn Fields. LOCAL COMMITTEES. Chester-Hayes Lyon, Esq. Ashburton-J. F. Kingston, Esq. C. C. Dendy, Esq. rie, F.R.S., Chairman. surer. Bridport-Wm. Forster, Esq. Chairman. J. Revnolds, Esq., Treas. Rev. Prof. Henslow, M.A., Rev. John Lodge, M.A. Coventry-Ar. Gregory, Esq. Edward Strutt, Esq., M.P. Etruria-Jos. Wedgwood, Esq. John Milford, Esq. (Coaver.) Dr. Malkin, Cowbridge. gwm. Guernsey-F. C. Lukis, Esq. Rev. Geo. Peacock, M.A., Keighley, Yorkshire- Rev. T. F.R.S. & G.S. Dury, M.A. Rev. Prof. Sedgwick, M.A., Launceston-Rev. J. Barfitt. J. Herman Merivale, Esq., James Mill, Esq. Rt. Hon. Lord Nugent. Dr. Roget, Sec. R.S., F.R.A.S. J. Whishaw, Esq., M.A., F.R.S. John Wrottesley, Esq., M.A. Neath-John Rowland, Esq. Esq., F.A.S., Chairman. - Rev. H. P. Hamilton, Sir Rd. Simeon, Bart., M.P. G. F. Burroughs, Esq. Shrewsbury-R. A. Slaney, Esq., M.P. South Petherton J. Nicholetts, Esq. Henry Coppock, Esq., Sec. Warwick-Dr. Conolly. The Rev. W. Field, (Leam.) Wolverhampton - J. Pearson, Worcester-Dr. Corbet, M.D. J. E. Bowman, Esq., F.L.S.. Major William Lloyd. Dawson Turner, Esq. THE THEORY OF PROJECTION, SO FAR AS IT IS WITH AN ACCOUNT OF THE PLANE SECTIONS OF THE CONE AND CYLINDER, IN WHICH CERTAIN GENERAL PROPERTIES OF THE CONIC SECTIONS ARE PUBLISHED UNDER THE SUPERINTENDENCE OF THE SOCIETY LONDON: BALDWIN AND CRADOCK, PATERNOSTER-ROW. MDCCCXXX. COMMITTEE. Chairman-H. BROUGHAM, Esq., F.R.S., M.P. Rt. Hon. J. Abercrombie. W. Allen. Esq., F.R.S. Rt. Hon. Viscount Ashley, M.P. Capt. F. Beaufort, R.N., F.R.S. T. F. Buxton, Esq., M.P., F.R S. J. Fred. Daniell, Esq., F.R.S. J. F. Davis, Esq. F.R.S. Hon. G. A. Ellis, M.A., M.P. I. L. Goldsmid, Esq., F.R.S. Vice Chairman-LORD JOHN RUSSELL, M.P. Treasurer-WILLIAM TOOKE, Esq., F.R.S. B. Gompertz, Esq., F.R.S. H. Hallam, Esq., F.R.S., M.A. E. Hill, Esq. Leonard Horner, Esq., F.R.S. Henry B. Ker, Esq., F.R.S. J. W. Lubbock, Esq., F. R. & L.S. James Mill, Esq. Sir H. Parnell, Bart., M.P. T. Spring Rice, Esq, M.P., F.A.S. C. E. Rumbold, Esq., M.P. Rt. Hon. Lord Suffield. H. Warburton, Esq., M.P., F.R.S. J. Whishaw, Esq., M.A., F.R.S. John Wood, Esq., M.P. Ashburton-J. F. Kingston, Esq. Rev. Jn. Corrie, Chairman. J. B. Estlin, Esq., F.L.S., Secretary. Cambridge-Rev. James Bowstead, M.A. Rev. Prof. Henslow, M.A., F.L.S. & G.S. Rev. Leonard Jenyns, M.A., F.L.S. Fred. Malkin, Esq., M. A. Rev. Geo. Peacock, M.A., F.R.S. & Marmaduke Ramsay, Esq. M.A., F.L.S. Rev. Prof. Sedgwick, M.A., F.R.S. & G.S. Professor Smyth, M.A. Rev. C. Thirlwall, M.A. Derby-Joseph Strutt, Esq. Wm. Strutt, Esq. Devonport-Major J. Hamilton Smith, Dublin-Hon. Thos. Vesey. D. Ellis, Esq., F.R.S. Capt. Basil Hall, R.N., F.R.S. Francis Jeffrey, Esq. Etruria-Jos. Wedgwood, Esq. J. Marshall, Jun., Esq. Dr. Traill, Chairman. J. Mulleneux, Esq., Treasurer. J. Ashton Yates, Esq. Maidenhead-R. Goolden, Esq., F.L.S. Manchester Local Association. R. G. Kirkpatrick, Esq. Newport Pagnell-James Millar, Esq. Norwich-Rich. Bacon, Esq. Plymouth-Geo. Harvey, Esq., F.R.S. Portsmouth-E. Carter, Esq. G. Grant, Esq. D. Howard, Esq. Rev. Dr. Inman, Nav. Col. Sheffield-J. H. Abraham, Esq. Shrewsbury--R. A. Slaney, Esq., M.P. South Petherton-John Nicholetts, Esq. Tavistock-Rev. Wm. Evans. John Rundle, Esq. Truro William Peter, Esq. Waterford-Sir John Newport, Bart. M.P. Wolverhampton-J. Pearson, Esq. Worcester-Dr. Corbet, M.D. Dr. Hastings, M.D. C. H. Hebb, Esq. THOMAS COATES, Secretary, 4, South Square, Gray's Inn. London: Printed by WILLIAM CLOWES, Stamford Street. Section 1. Of lines, perpendicular, or inclined, or parallel, to planes. 2. Of planes which are parallel, or inclined, or perpendicular, to other I. Of projection, by lines diverging, and by lines parallel II. Of the plane sections of the right cone, or conic sections III. Plane sections of the oblique cone, of the right cylinder, and of the |