CONTENTS. IX 



Page 

 Steam-engine boiler, and Smith's fire, in the Gwendraeth Ironworks 



near Caermarthen 130 



Mr. Jeffries on Warming and Ventilating 131 



Mr. Beart's Account of a Method of Filtering Liquids 131 



Mr. Dredge's Remarks on Bridge Architecture 131 



Mr. John Britton on the Scientific principles, geometrical forms and 

 proportions, and the constructive skill manifested in the execution of 

 the Cathedrals and other large Churches of the Middle Ages ; with in- 

 cidental remarks on the symmetry, unity, and harmony, of ancient 

 Ecclesiastical Architecture. Illustrated by numerous Drawings . . 131 



Mr. C. ViGNOLES on Percussion Boring of Tunnels 131 



Mr. Wm. Carpmael on the method of rolling Dovetailed Grooves for 



Railways 131 



Mr. Thomas Parkin on a new construction of Wooden Railway Wheels. 131 



Mr. Thomas Parkin on Railway Foundations 132 



Dr. Ure on the Evaporative Calorific Powers of Fuel 132 



Mr. W. J. Curtis on methods adapted to increase the security and ex- 

 tend the advantages upon Railroads 132 



Mr. Stephen Geary on a new method of forming Fuel 132 



Mr. King on a new Kitchen Range, with a Model 132 



Mr. John Isaac Hawkins on folding Plates in Books and Maps for 

 the Pocket 132 



