CONTENTS OF VOL. XXV. 



(THIRD SERIES.) 



NUMBER CLXIIL— JULY, 1844. 



Page 



Prof. Draper on Tithonized Chlorine 1 



Sir W. R. Hamilton on Quaternions ; or on a new System of 



Imaginaries in Algebra 10 



Mr. J. Middleton's Comparative Analysis of Recent and Fossil 



Bones 14 



The Rev. J. Booth on the Rectification and Quadrature of the 



Spherical Ellipse 18 



Dr. R. D. Thomson on Parietin, a yellovr colouring matter, and 



on the Inorganic Constituents of Lichens 39 



Professor Draper on Mr. Hunt's Book, entitled " Researches on 



Light." 49 



Mr. T. S. Thomson's Observations on the Diffusion of Gases . 5 1 

 Messrs. C. F. O. Glassford and J. Napier on the Cyanides of 

 the Metals, and their Combinations with Cyanide of Potas- 

 sium. Part I. Cyanide of Gold 56 



Messrs. C. F. O. Glassford and J. Napier on the Cyanides of 

 the Metals, and their Combinations with Cyanide of Potas^ 



slum. Part II. Cyanide of Silver 66 



Proceedings of the Royal Astronomical Society 71 



On the laws which govern the Electro-chemical Decomposition 



of Bodies, by M. Edmond Becquerel 73 



Proto- and Per-arsenite and Arseniate of Iron 74 



Description and Analysis of Pennine, by MM. Marignac and 



Descloizeaux 75 



On the Preparation and Properties of certain Chlorates, by M. 



Alexander Waechter 76 



On the Chlorides of Gold 77 



On Bresilin and Bresilein, by M. Preisser 78 



Meteorological Observations for May 1844 79 



Meteorological Observations made by Mr. Thompson at the 

 Garden of the Horticultural Society at Chiswick, near 

 London ; by Mr. Veall at Boston ; by the Rev. W. Dunbar at 

 Applegarth Manse, Dumfries-shire ; and by the Rev. C. 

 Clouston at Sand wick Manse, Orkney 80 



NUMBER CLXl v.— AUGUST. 



J.'s Desultory Remarks on Academic and Non-Academic 



Mathematics and Mathematicians 81 



a2 



