CONTENTS. 



PAKT II. 



PAOK 



No. I. On a Chart and Diagram for facilitating Cheat-Circle Sailing. By Hugh 



GoDFRAY, M.A., St John's College 271 



II. Suggestion of a Proof of the Theorem that every Algebraic Equation has 



a Boot. By G. B. Airy, Esq., Astronomer Royal 283 



III. On tlis General Principles of which tlie Composition or Aggregation of 



Forces is a Consequence. By Augustus De Morgan, F.R.A.S., of 

 Trinity College, Professor of Matliemaiics in University College, London 290 



IV. On Platds Cosmical System as exJdbited in the Tenth Book of " The 



Republic." By J. W. Donaldson, D.D., Trinity College; Vice-Presi- 

 dent of the Society 305 



V. On the Origin and Proper Use of tihe word Argument. By J. W. 



Donaldson, D.D., late Fellow of Trinity College, Cambridge 317 



VI. Supplement to a Proof of the TJieorem tlwA every Algebraic Equation lias 



a Root. By G. B. Airy, Esq., Astronomer Royal 327 



VII. On the Syllogism, No. IV., and on the Logic of Relations. By Augustus 



De Morgan, F.RA.S., of Trinity College, Professor of Maifiematics 



in University College, London 331 



VIII. On the Motion of Beams and thin Elastic Rods. By 3. H. Eohbs, M.A., 



Fellow of the Cambridge Philosophical Society — 359 



IX. On a Metrical Latin Inscription copied by Mr Blakesley at Cirta and 

 pvhlished in his "Four Months in Algeria." By H. A. J. Muneo, M.A., 

 Fellow of Trinity College 374 



X. On the Thfiory of Errors of Observation. By Augustus De Morgan, 



F.R.A.S., of Trinity College, Professor of Mathematics in University 

 College, London 409 



XI. On the Syllogism, No. V., and on various points of the Onymatic System. 



By Augustus De Morgan, F.R.A.S., of Trinity College, Professor 



of Mathematics in University College, London 428 



