vlii CONTENTS. 



Page 

 Specific Heat of Elastic Fluids — Dr. Tliomson's Experiments on 



Gold ^60 



Supposed New vegeto- Alkali, Chinioidia 4'61 



Chemical Action of Light— Dr. Webster's Dictionary 462 



New Patents — Aurora Borealis 463 



On the Difference in the Height of Spring Tides 464 



Observations on the Planet Venus in the Day-time — Meteoro- 

 logical Observations 465 



Index 468 



PLATES. 



I. Plate illustrative of Mr, King Williams's New Paddle-Wheel. 



II. Plate illustrative of Mr. De la Beche's Paper on the Formation of 

 Conglomerate and Gravel Deposits. 



