Yl CONTENTS. 



Page 



Prof. De Morgan on the Relation between the Number of Faces, 

 Edges and Corners in a Solid Polyhedron 323 



Prof. J. F. W. Johnston on the received Equivalents of Potash, 

 Soda and Silver 324 



On the Path of the projectile Weapon of the Native Australians 

 called the " Boomarang" or " Kylee" 229 



Mr. A. Smith's Method of finding the Equation to Fresnel's 

 Wave-Surface 335 



Mr. T. Taylor's Description of two Calculi composed of Cystic 

 Oxide 337 



Prof. J. F. W. Johnston on the Composition of certain Mineral 

 Substances of Organic Origin. 2. Hatchetine 338 



MM. Pelouze and Richardson's Researches upon the Products 

 of the Decomposition of Cyanogen in Water 339 



Prof. J. J. Sylvester's Notes to Analytical Development, &c.. . 341 



Mr. G. B. Jerrard on the Occurrence of the form g in passing 

 from general to particular Values of certain Algebraic Func- 

 tions 345 



Proceedings of the Ptoyal Society, and Royal Irish Academy . . 347 



New Books : — H. C. Agnew's Letter from Alexandria on the 

 Evidence of the practical Application of the Quadrature of 

 the Circle in the Configuration of the Great Pyramids of 

 Gizeh 379 



Improvements in Magnetical Apparatus by the Rev. W. 

 Scoresby 380 



On the Constitution of some Organic Acids, by M. Dumas and 

 M. Liebig 381 



Meteorological Observations 382 



NUMBER LXXVI.~MAY. 



Remarks on " A singular Case of the Equilibrium of incom- 

 pressible Fluids ; by M. Ostrogradsky" 385 



Prof. J. F. W. Johnston on the Dimorphism of the Chromate of 

 Lead 387 



Prof. J. F. W. Johnston on the Composition of certain Mineral 

 Substances of Organic Origin. 3. Ozocerite 389 



Dr. Dalton's Sequel to an Essay on the Constitution of the 

 Atmosphere published in the Philosophical Transactions for 

 1826 ; with some Account of the Sulpliurets of Lime .... 397 



Mr. Brooke's Note on an apparent Case of Isomorphous Sub- 

 stitution 406 



Mr. R. Phillips's Observations on Isomorphism, in reference to 

 the preceding Communication by Mr. 6rooke 407 



Mr. T. Taylor's Observations on Urinary Calculi 412 



Mr. D. Cooper on the Luminosity of the Human Subject after 

 Death ' 420 



Proceedings of the Royal, Geological, and Zoological Societies ; 

 of the Royal Institution, and the Cambridge Philosophical 

 Society . .' , 426 



