ii - CONTENTS. 



Art. XII. Tour to the South of France and the Pyrenees in 

 1825. By G. A. Walker Arnott, Esq. A.M. 

 F. L. S. & R. S. E. &c. In a Letter to Professor 

 Jameson. (Continued from p. 70.) - 268 



XIII. On the Changes which the Laws of Mortality have 



undergone in Europe within the last Half Cen- 

 tury, or from 1775 to 1825. By M. Benoiston 



DE ChaTEAUNEUF, - - _ 275 



XIV. Observations on some Fossil Vegetables of the Coal 



Formation, and on their relations to living Ve- 

 getables. By M. Ad. Brongniart. With a Plate. 282 

 XV. Professor P. Prevost upon the Magnetical In- 

 fluence of the Sun, - - - 289 



XVI. On the Reaction of Sulphate of Magnesia and Bi- 

 carbonate of Soda. By M. Planche, - 292 



XVII. Observations on the Nature and Importance of 



Geology, _ - _ _ 293 



XVIII. On Female Pheasants assuming the Male Plumage- 

 By M. Isidore Geoffroy St Hilaire. With 

 Notes by the Editor, - - - 302 



XIX. 1. Caventou on the Chemical Properties of Starch, 

 and the various Amylaceous Substances of Com- 

 merce. 2. Engelhart on the Colouring Prin- 

 ciple of the Blood. 3. On Arsenic, its Oxides, 

 and Sulphurets ; by M. Guibourt. 4. Prepara- 

 tion of Chloride of Lime. 5. On the detection 

 of Arsenic. 6. On Cafeine. 7- Analysis of 

 the Root of Bryonia alba. 8. General Treus- 

 SART on the Preparation of Hydraulic Cements. 

 9. On a New Method of Purifying Crystals ; by 

 M. RoBiNET. 10. Repetition of the Comparison 

 of the Rate of the Mercurial and Spirit Thermo- 

 meter, - - . - - 311-326 

 XX. Description of the Ciconia Ardgala, or Adjutant 



Bird. By J. Adam, M. D. - - 327 



XXI. On the Theory of the Air-Thermometer. By Mr 



Henry Meikle. Communicated by the Author. 332 



XXII. Observations on the Structure of some Siliceous 

 Sponges. By R. E. Grant, M. D. F. R. S. E. 

 F. L. S. M. W. S. Honorary Member of the Nor- 

 thern Institution, &c. Communicated by the 

 Author, - - - . 341 



