CONTENTS. IX 



Biographical Notice of Dr Chalmers. By the Very Rev. E. B. 

 Rarasay, . . . . . . .226 



An Attempt to compare the Exact and Popular Estimates of Pro- 

 bability. By Bishop Terrot, . . . .228 



On the Gradual Production of Luminous Impressions on the Eye, 

 and other phenomena of Vision. By William Swan, Esq., . 230 



Note on the Refractive and Dispersive Powers of the Humours of 

 the Eye, determined by Experiment. By John Adie, Esq., . 232 



On Grooved and Striated Rocks in the Middle Region of Scot- 

 land. By Charles Maclaren, Esq., .... 233 



On a Simple Form of Rain-Gauge. By the Rev. Dr Fleming, . 234 

 On a Method of Cooling the Atmosphere of Rooms in a Tropical 

 Climate. By Professor Smyth, .... 235 



Notice of a Shooting-Star. By Professor Smyth, . . 236 



A few Unpublished Particulars concerning the late Dr Black. By 

 Dr George Wilson, . . . • . 238 



On a New Voltaic Battery of Intense Power. By Dr Wright. 

 Communicated by Dr George Wilson, . . . 239 



On a New Species of Manna, from New South Wales. By Dr 

 Thomas Anderson, ..... 239 



Account of a Peculiar Structure found in the Vagmarus Islandicus. 

 By Dr John Reid. Communicated by Professor Goodsir, . 241 



Notes to a Paper on the Motive Power of Heat. By Professor 

 William Thomson, ..... 241 



Note regarding an Experiment suggested by Professor Robison. 

 By Professor Forbes, ..... 244 



Personal Observations on Terraces, and other Proofs of Changes 

 in the relative Level of Sea and Land in Scandinavia. By 

 Robert Chambers, Esq., ..... 247 



Note respecting the Dimensions and Refracting Power of the Eye, 

 By Professor Forbes, ..... 251 



On the Intensity of Heat reflected from Glass. By Professor Forbes, 256 



On tlie Solution of- certain DiiFerential Equations. By Professor 

 Kelland, . . . . . . .257 



On the Muscular Substance of the Tongue. By Mr Zaglus. Com- 

 municated by Professor Goodsir, .... 258 



On the Volcanic Formations of the Alban Hills, near Rome. By 

 Professor Forbes, ...... 259 



On the Gamboge Tree of Siam. By Dr Christison, . . 263 



Notice respecting a Deposit of Shells near Borrowstounness. By 

 Charles Maclaren, Esq., ..... 265 



An Account of some Monstrosities. By the late Dr J. Reid. Com- 

 municated by Professor Goodsir, .... 267 



The EflFect of Pressure in Lowering the Freezing-Point of Water 

 experimentally demonstrated. By Prof. W. Thomson, Glasgow, 267 



On the Extinction of Light in the Atmosphere. By W. S. Jacob, 

 Esq., H.E.I.C. Astronomer, Madras. Communicated by Pro- 

 fessor Smyth, ...... 271 



Abstract of a Paper on the Hypothesis of Molecular Vortices, and 

 its Application to the Mechanical Theory of Heat. By W. J. M. 

 Rankine, Esq., Civil Engineer, . . . . 275 



