XVIU CONTENTS. 



on three proximate principles which they contain. Part II. 

 By Dr Hope, ....... 419 



On certain negative actions of Light. By Professor Moser of 



Koenigsberg. In a Letter to Sir David Brewster, . . 422 



On the Specific Gravity of certain substances commonly considered 

 lighter than Water. By Dr Davy, .... 424 



On the presence of Organic Matter in the purest waters from Ter- 

 restrial Sources. By Professor Connell, . . . 426 



Biographical Sketch of the late Sir Charles Bell. By Sir John 

 MacXeill, ....... 427 



Notice regarding the Bebeeru Tree of British Guiana. By A. 

 Douglas Maclagan, ...... 427 



An attempt to explain the phenomena of the Freezing Cavern at 

 Oranburg. By Dr Hope, .... 429 



Observations on the Temperature of the Earth in India. By John 

 Caldecott, Esq. Communicated in a Letter to Professor 

 Forbes, ........ 432 



Researches in Hydrodynamics. Second Memoir. On Waves. By 

 J. Scott Russell, Esq., ...... 433 



On the Influence of various circumstances in Vegetation upon the 

 activity of plants. Part II. The Umbelliferous Narcotics. By 

 Dr Christison, . ■ ..... 437 



A Description of Congenital Malformation of the Auricle and Ex- 

 ternal Meatus of both sides, in three persons ; with Experiments 

 on the state of Hearing in them, and Remarks on the mode of 

 Hearing by conduction through the hard parts of the Head in 

 general. By Dr Allen Thomson, "... 443 



On the Luminousness of the Sea. By Dr Traill, . . 446 



On the Fossil Vegetables of the Sandstone of Ayrshire, illustrative 

 of a series of them, as a Donation for the Society's Museum. By 

 J. Shedden Patrick, Esq., . . . . . 443 



On a new Self-Registering Barometer. By Robert Bryson, Esq., 450 



On the Vibrations of an Interrupted Medium. By Professor Kel- 

 land, ........ 450 



On certain laws of the Resistance of Fluids. By J. Scott Russell, 

 Esq., ........ 451 



Chemical Examination of the Tagua Nut, or Vegetable Ivory. By 

 Professor Connell, ...... 451 



On the Tides of the Firth of Forth, and the East Coast of Scotland. 

 By J. Scott Russell, Esq., ..... 453 



Additional Observations as to the Poisonous Properties of CEnanthe 

 Crocata. By Dr Christison, ... . 453 



On the Cellular Fibre, and the incrusting Matters of Plants. By 

 Mr P. F . H. Fromberg. Communicated by Professor Johnston, 454 



On a remarkable Oscillation of the Sea observed at various places 

 on the Coasts of Great Britain, in the first week of July 1843. 

 By David Milne, Esq., . . . . . .457 



On the Human Races in Britain, enumerated by Tacitus. By Dr 

 Hibbert Ware, .-...., 459 



