1865.] T. A. Hirst on the Quadric Inversion of Plane Curves. 91 



March 2, 1865. 

 Major-General SABINE, President, in the Chair. 



In accordance with the Statutes, the names of the Candidates for election 

 into the Society were read, as follows : 



James Abernethy, Esq., C.E. 

 A. Leith Adams, M.B. 

 Alexander Armstrong, M.D. 

 William Baird, M.D. 

 George Bishop, Esq. 

 John Charles Bucknill, M.D. 

 Lieut.-Col. Cameron, R.E. 

 Henry Christy, Esq. 

 The Hon. James Cockle. 

 The Rev. William Rutter Dawes. 

 W. Boyd Dawkins, Esq. 

 Henry Dircks, Esq. 

 Thomas Rowe Edmonds, Esq. 

 Professor Henry Fawcett. 

 Peter Le Neve Foster, Esq. 

 Sir Charles Fox, C.E. 

 Archibald Geikie, Esq. 

 George Gore, Esq. 

 Professor Robert Grant. 

 George Robert Gray, Esq. 

 William Augustus Guy, M.B. 

 Capt. Robert Wolseley Haig, R.A. 

 George Harley, M.D. 

 Benjamin Hobson, M.B. 

 William Huggins, Esq. 

 Fleeming Jenkin, Esq., C.E. 

 Edmund C. Johnson, M.D. 

 Henry Letheby, M.B. 



Professor Leone Levi. 

 Waller Augustus Lewis, M.B. 

 John Robinson M'Clean, Esq., C.E. 

 Capt. Sir F. Leopold M'Clintock, 



R.N. 



Robert M'Donnell, M.D. 

 Hugo Muller, Esq., Ph.D. 

 Charles Murchison, M.D. 

 Andrew Noble, Esq., C.E. 

 Sir Joseph P. Olliffe, M.D. 

 William Kitchen Parker, Esq. 

 William Henry Perkin, Esq. 

 Thomas Lamb Phipson, Esq., Ph.D. 

 Charles Bland Radcliffe, M.D. 

 Lovell Reeve, Esq. 

 John Russell Reynolds, M.D. 

 Thomas Richardson, Esq., Pli.D. 

 Wm. Henry Leighton Russell, Esq. 

 Edward Henry Sieveking, M.D. 

 Alfred Tennyson, Esq., D.C.L. 

 George Henry Kendrick Thwaites, 



Esq. 



The Rev. Henry Baker Tristram. 

 Lieut.-Col. James Thomas Walker, 



R.E. 



A. T. Houghton Waters, M.D. 

 Charles Wye Williams, Esq. 

 Henry Worms, Esq. 



The following communications were read : 



I. " On the Quadric Inversion of Plane Curves." By T. A. HIRST, 

 F.R.S. Received February 16, 1865. 



Introduction. 



1 . The method of inversion which forms the subject of the present paper 

 is an immediate generalization of that now universally employed. In 

 place of a fixed circle with the origin at its centre, any fixed conic (jpuubic) 



VOL. XIV. I 



