CONTENTS. 



Page 



Art. I. On the Diminution of Temperature with Height in 



the Atmosphere, at different seasons of the year. 



By James D. Forbes, Esq., F. R. SS. L. & E., 



Professor of Natural Philosophy in the University 



of Edinburgh, .... 205 



» 



- II. On the Comparative Illuminating and Heating 

 power of different kinds of Coal-gas Burners, and 

 on the use of Coal- gas as a source of Heat. By 

 Andrew Fyfe, M.D., F.R.S.E. Communicated 

 by the Society of Arts, . . 214 



I. On the Comparative Illuminating Power of Gas- 



Bumers, . . . . .214 



II. On the Comparative Heating Power of Gas-BumerS; 227 



III. On the use of Gas as a source of Heat, . 231 



III. Beryl Mine of Paddioor, and Geognostic Position 



of this Gem, in Coimbatoor, Southern India. By 

 Lieutenant Newbold, Madras Army, A. D. C. to 

 Brigadier-General Wilson, C. B. Communicated 

 by the Author, . . . .241 



IV. On the Construction of Circular Towers. By Ed- 



ward Sang, Esq., Civil-Engineer, Edinburgh, 

 M.S.A. Communicated by the Society of Arts, 245 



V. Of the Relation of Tradition to Palaetiology. By 



the Rev. William Whewell, B.D., 258 



1. Importance of Tradition. 2. Connection of Tradi- 

 tion and Science. 3. Natural and Providential 



