1 
II. 
CONTENTS. 
PART I. 
SCIENCE. 
Third Supplement to an Essay on the Theory of Systems of Rays. 
By William R. Hamilton, A.B., M.R.I.A., MR. Ast. Soc. London, 
M. G. Soc. Dublin, Hon. M. Soc. Arts Sor Scotland, Hon. M. Ports- 
mouth Lit. and Phil. Soc., Member of the British Association Sor the 
Advancement of Science, Fellow of the American Academy of Arts 
and Sciences, Andrews’ Professor of Astronomy in the University of 
Dublin, and Royal Astronomer of Ireland. Read January 23, 1832, 
and October 22, DSN eon aes cosis ve caisnci<ewsinds ahs Omasatcent a ecee daca stncu icc 
On the Phenomena presented by Light in its passage along the Axes 
of Biaral Crystals. By the Rev. Humphrey Lloyd, A.M., M.R.LA., 
Fellow of Trinity College, and Professor of Natural and Eperimental 
Philosophy in the University of Dublin. Read January 28, 1833 
seseee 
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