VI CONTENTS. 



Page 



VI. On the Parasitic Formation of Mineral Species, depend- 

 ing upon Gradual Changes which take place in the In- 

 terior of Minerals, while their External Form remains 

 the same. By WILLIAM HAIDINGER, Esq. F. R. S. Ed. 73 

 VII. On the Influence of the Air in determining the Crystalli- 

 zation of Saline Solutions. By THOMAS GRAHAM, Esq. 

 A. M. - 114 



VIII. Mineralogical Account of the Ores of Manganese. By 



WILLIAM HAIDINGER, Esq. F. R. S. Ed. - 119 



IX. Chemical Examination of the Oxides of Manganese. By 

 EDWARD TURNER, M. D., F. R. S. Ed., Professor of 

 Chemistry in the University of London, Fellow of the 

 Royal College of Physicians of Edinburgh, - - - 143 

 X. An Account of the Formation of ALCOATES, Definite Com- 

 pounds of Salts and Alcohol, analogous to the Hydrates. 

 By THOMAS GRAHAM, Esq. A. M. - - - 175 



XI. An Account of the Tracks and Footmarks of Animals 



found impressed on Sandstone in the Quarry of Corn- 

 cockle Muir in Dumfriesshire. By the Rev. HENRY 

 DUNCAN, D. D. Minister of Ruthwell, - 194 



XII. On the Combination of Chlorine with the Prussiate of Po- 



tash, and the presence of such a compound as an impu- 

 rity in Prussian Blue. By JAMES F. W. JOHNSTON, 

 A. M. - 210 



XIII. On a Mass of Native Iron from the Desert of Atacama 



in Peru. By THOMAS ALLAN, Esq. F. R. S. Ed. - 223 



XIV. Observations on the Structure of the Fruit in the Order 



of Cucurbitacece. By FRANCIS HAMILTON, M. D., 



F. R. S. & F. A. S. Lond. & Ed. - 229 



