PART I MANUSCRIPTS

Systems of Rays. Part Third

Two Letters to Augustus de Morgan(1858)

Letter to Hart on Anharmonic Coordinates(1860

PART II. GEOMETRY

^{On SymI}be1 Geometry (1846-49)

I Cambridge and Dublin Mathematical Journal, 1, 45-57, 137-154, 256-263

(1846);2,47-52,130-133,204-209(1847);3,68-84,220-225(1848);

4,84-89,105-118(1849)]

On some new applications of Quaternions to Geometry (1849)

British Association Report 1849, Part II,p. I

On Polygons inscribed on a Surface of the Second Order(1850)

British Association Report 1850, Part IL, p. 2.]

Symbolical Extensions of Quaternions; and Geometrical Applications of

Quaternions(1855)

[Proceedings of the Royal Irish Academy 6, 250, 260, 311(1858).]

VIII

XI

XIII

On a General Expression by Quaternions for Cones of the Third Order

(1857)

[Proceedings of the Royal Irish Academy 6, 506, 512(1858).

On a certain harmonic property of the envelope of the chord connect-ing two corresponding points of the Hessian of a Cubic Cone(1857)

[Proceedings of the Royal Irish Academy 6, 524(1858).]

On some applications of Quaternions to Cones of the Third Degree

(1857)

[ British Association Report 1857, Part II, p. 3.]

On Anharmonic Co-ordinates(1860

[Proceedings of the Royal Irish Academy 7, 286-289, 329, 350-354(1862).] 507

On Geometrical Nets in Space(1861)

[Proceedings of the Royal Irish Academy 7, 532-582(1862).

On Geometrical Nets in Space(1861)

British Association Report 1861, Part II, p. 4.]