CONTENTS. 
IX 
406. 
407. 
408. 
409. 
410. 
411. 
412. 
413. 
414. 
415. 
416. 
PAGE 
On the Curves which satisfy given Conditions . . . . 191 
Phil. Trans, t. clviii. (for 1868), pp. 75—143 
Second Memoir on the Curves which satisfy given Conditions; 
the Principle of Correspondence . . . . . 263 
Phil. Trans, t. clviii. (for 1868), pp. 145—172 
Addition to Memoir on the Resultant of a System of two 
Equations .......... 292 
Phil. Trans, t. clviii. (for 1868), pp. 173—180 
On the Conditions for the existence of three equal Roots or 
of two pairs of equal Roots of a Binary Quartic or 
Quintic .......... 300 
Phil. Trans, t. clviii. (for 1868), pp. 577—588 
A Third Memoir on Skew Surfaces, otherwise Scrolls . . 312 
Phil. Trans, t. clix. (for 1869), pp. Ill—126 
A Memoir on the Theory of Reciprocal Surfaces . . . 329 
Phil. Trans, t. clix. (for 1869), pp. 201—229 
A Memoir on Cubic Surfaces . . . . . . . 359 
Phil. Trans, t. clix. (for 1869), pp. 231—326 
A Memoir on Abstract Geometry . . . . . . 456 
Phil. Trans, t. clx. (for 1870), pp. 51—63 
On Polyzomal Curves, otherwise the Curves JU+JV+kc. = 0. 470 
Trans. R. Soc. Edinburgh, t. xxv. (for 1868), pp. 1—110 
Corrections and Additions to the Memoir on the Theory of Reci 
procal Surfaces . . . . . . . . . 577 
Phil. Trans, t. clxii. (for 1872), pp. 83—87 
On the Theory of Reciprocal Surfaces 582 
Addition to Salmon’s Analytic Geometry of Three Dimensions, 4th ed. 
(1882), pp. 592—604 
Notes and References 
Plates . 
Portrait 
593 
to face pp. 52, 122, 190 
. . to face Title.