CONTENTS 



OF 



VOLUME ELEVENTH. 



* L i~*' e 



PART FIRST. A . 4 



Page 



I. Description of STERNBERGITE, a New Mineral Species. 



By W. HAIDINGER, Esq. F. R. S. Ed. - l 



II. A Description of some Remarkable Effects of UNEQUAL 

 REFRACTION, observed at Bridlington Quay in the sum- 

 mer of 1826. By the Reverend WILLIAM SCOEESBY, 

 F. R. SS. Lond. & Edin., M. W. S., and Corresponding 

 Member of the Institute of France, - 8 



III. On a New Combustible Gas. By THOMAS THOMSON, 



M. D., F. R. SS. Lond. & Edin., Professor of Chemistry 



in the University of Glasgow, 15 



IV. Some Experiments on Gold. By THOMAS THOMSON, 



M. D., F. R. SS. Lond. & Edin., Professor of Chemistry 

 in the University of Glasgow, 23 



V. On the Construction of Polyzonal Lenses, and their Com- 

 bination with Plain Mirrors, for the purposes of Illu- 

 mination in Lighthouses. By DAVID BREWSTER, LL.D. 

 F. R. SS. Lond. & Edin. - - 33 



