CONTENTS. Ill 



XII. On the Revolutions of Iceland, Political and Natural, 824 



Xni. On the Colour of the Ocean. By M. Arago, 330 



XIV. Description, with Drawings, of a Grinding Machine 

 which is used instead of a Turning Lathe, for 

 giving a truly Cylindrical form to the rims of Pul- 

 leys and Drums : — also Drawing and Description 

 of a Machine for Grinding Pulleys round on the 

 rim. By Mr James Whitelaw. Communicated 

 by the Society of Arts. With two Plates, 333 



XV. On btorms. By William C. Redfield of New 

 York, and Lieutenant-Colonel Reid, Royal En- 

 gineers, .... 342 

 XVI. On the probable Duration of Human Life, 330 

 XVII. Short Account of some Researches upon the Varia- 

 tions which take place at certain times of the day 

 in the Temperature of the Lower Strata of the 

 Atmosphere. By Professor Marcet, . 333 



XVIII. Observations and Experiments made upon the Cause 

 and Effects of Vinous Fermentation. By M. Cag- 

 NiARD Latour, . . . 337 



XIX. Observations taken at St Bernard's Crescent, Edin- 

 burgh, on the 21st and 22d June 1838. Height 

 above the Sea 110 English feet. By a Committee 

 of the Physico-Mathematical Society, . 364 



XX. A brief View of the Botany of Ireland. By J. T. 



Mackay, M.R.I.A., A.L.S., * . . 363 



XXI. Summary of some new Inquiries concerning the Dis- 

 engagement of Caloric by Friction. By M. Bec- 

 QUEREL, President of the Academy of Sciences 

 for the year 1838, . . . 368 



XXII. On Professor Ehrenberg and Hausmann's Discove- 

 ries regarding two varieties of Siliceous E^rth 

 found near Oberohe in the Hanoverian Province 

 of Luneberg, .... 373 



XXIII. On the Last Changes in the relative Levels of the 

 Land and Sea in the British Islands. By James 

 Smith, Esq. of Jordanhill, F.R.S.L. & E., F.G.S., 

 & M.W.S., • . . . 878 



