Several short communications by William Rowan Hamilton, applying the method of quaternions to geometrical questions, were published in volume 4 of the Proceedings of the Royal Irish Academy.

A communication by Hamilton entitled

was published in volume 4 of the Proceedings of the Royal Irish Academy (1850), p. 173.On the Double Mode of Generation of an Ellipsoid

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A communication by Hamilton entitled

was published in volume 4 of the Proceedings of the Royal Irish Academy (1850), pp. 192-193.Additional Theorems respecting certain Reciprocal Surfaces

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A communication by Hamilton entitled

was published in volume 4 of the Proceedings of the Royal Irish Academy (1850), pp. 306-308.On Theorems relating to Surfaces, obtained by the Method of Quaternions

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A communication by Hamilton entitled

was published in volume 4 of the Proceedings of the Royal Irish Academy (1850), pp. 324-325.On an Equation of the Ellipsoid

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A communication by Hamilton entitled

was published in volume 4 of the Proceedings of the Royal Irish Academy (1850), pp. 325-326.On the Inscription of certain ``Gauche'' Polygons in Surfaces of the Second Degree

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A communication by Hamilton entitled

was published in volume 4 of the Proceedings of the Royal Irish Academy (1850), pp. 341-342.On the construction of the Ellipsoid by two sliding spheres

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A communication by Hamilton entitled

was published in volume 4 of the Proceedings of the Royal Irish Academy (1850), p. 349-350On a Theorem respecting Ellipsoids, obtained by the Method of Quaternions

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D.R. Wilkins(

School of Mathematics

Trinity College, Dublin