ii CONTENTS. 



Art. IX. Description of the Apparatus or Signal-Post for re- 

 gulating Chronometers. By R. Wauchope, Esq. 

 Captain R. N. With a Plate. Communicated by 

 tlie Author, - - _ . 289 



X. On Miargyrite and Jamesonite, - - 292 



XI. On the relative Age of the different European Chains 



of Mountains, - " - - - 293 



XII. Observations on the Fontaine Ronde, a Periodical 



Spring on the Jura. By M. Dutrochet, 307 



XIII. On the Height of the Perpetual Snows on the Cor- 



dilleras of Peru, - - - 3l 1 



XIV. Observations on a paragraph in the last Number of 



the Edinburgh New Philosophical Journal. By 

 W. J. Broderip, Esq. F. R. 8. Communicated 

 by the Author, - - - - 312 



XV. On supposed Vegetable Remains in Chalk. By Gi- 

 deon Mantell, Esq. F. R. S. In a Letter to 

 the Editor, _ - . - 313 



XVI. Notes regarding the Serpentine Rocks on Dee Side. 

 By the Rev. Jambs Farquharson. Communi- 

 cated by the Author, - - - 314 

 XVII. On the Hya-hya, or Milk- Tree of Demerara. In a 

 Letter to Professor Jameson from James Smith, 



Esq. 314 



XVIII. Notes relative to the dried specimen of the Hya-hya. 

 By G. A. W. Arnott, Esq. F. L. S. F. R. S. E. 

 &c. - - - - - 319 



XIX. On the Formation of the Earth. By the late Sir 



H. Davy, - - - - 320 



XX. Lectures on the History of the Natural Sciences. 



By Baron Cuvier, ... 32(5 



Lectures I. & IL Earliest History of the Human 



Species, . , . . . ib. 



Lecture III. Egypt, .... 334 



Lecture IV. Greece, - - - 342 



XXI. On the Heights of the most remarkable Summits of 



the Cordillera of the Andes in Peru, - 350 



XXII. On the Chemical Constitution of Brewsterite. By 

 Arthur Connell, Esq. F. R. S. E. Communi- 

 cated by the Author, - - - 355 

 XXIII. Queries respecting the Natural History of the Sal- 

 mon, Sea-Trout, BuU-Trout, Herling, &c. By Sir 

 AViLLiAM Jardinb, Bart. F.R.S.E. M.W.S. &c. 358 



