CONTENTS OF THE FOURTH VOLUME. 



Part I. 



PAr.E 



N°. I. rmttmx Fauna; et Flora; Madera; et Portus Saudi; sii'c Species qumdam 

 Nova; vel hactenus minus rite cognitw Animalium et Ptantarum in his Insulin 

 degentium brcviter descriptor : by R. T. Lowe, Esq 1 



II. On the General Equation of Curves of the Second Degree: by Augustus 



De Morgan, Esq., Professor in the University of London 71 



III. On the Nature of the Light in the two Rays produced by the Double Refrac- 



tion of Quartz : by Professor Airy 70. 



IV. On the Resolution of Algebraical Equations: by the Rev. R. Murphy 12."> 



V. Mathematical Exposition of some of the Leading Doctrines in Mr. Ricardo's 



"Principles of Political Economy and Taxation :" by the Rev. W. Whewei.l 155 



Addition to a Paper " Ou the Nature of the Light in the Two Rays produced 

 by the Double Refraction of Quartz :" by Professor Airy 199 



Part II. 



VI. Desoription of Chiasognathus Grantii, a new Lucanideous Insect forming the 

 type of an undescribed Genus, together with some brief Remarks upon its 

 Structure and Affinities. In a Letter addressed to one of the Secretaries: by 

 J.F.Stephens, Esq. P.L.S 2l>o. 



VII. A case of Human Monstrosity, with a Commentary : by the Rev. W. Clark, M.D. 21<> 



VIII. On the Examination of a Hybrid Digitalis: by the Rev. Professor Henslow 2.57 



IX. On a Remarkable Modification of Newton's Rings : by Professor Airy '27!) 



X. A Monograph on the British species qfCyclas and Pisidium : by the Rev. L. Jenyns 28f) 

 XI. On a new Analyzer, and its Use in Experiments of Polarization: by Professor Airy 313 



