ii CONTENTS. 



Art. VII. On the Probable Origin of Mineral Springs. By C. 



E. Stifft, formerly Mining Engineer to the 

 Duke of Nassau, - , - . 290 



VIII. Notice regarding a Specimen of Siren lacertina which 

 was preserved alive for more than six years at 

 Canonmills, near Edinburgh. Communicated 

 by Mr Neill, - - - - 298 



XI. On the Fossil Bones of Wellington Valley, New Hol- 

 land, or New South Wales. By Mr Pentland. 

 Communicated by the Author, - - 301 



X. Analysis of the Vibration of Wires. By Edward 

 Sang, Esq. Teacher of Mathematics. Commu- 

 nicated by the Author, - - - - 808 

 XI. On the Uniform Permeability of all known Substances 

 to the Magnetic Influence, and the Application 



i of the fact in Engineering and Mining, for the 



Determination of the Thickness of Solid Sub- 

 stances not otherwise Measurable. By the Rev. 

 William Scoresby, F. R.S. L. & Ed., Corres- 

 pondent of the Institute of France, &c &c. 

 Communicated by the Author, . - ' 319 



XII. Register of the Thermometer kept at Wanlockhead, 



during the Summer of 1828. By Mr Lang. 

 Communicated by the Author, - - 335 



XIII. Abstract of the Meteorological Journal of the Banff 



Institution, kept at Banff Castle, from 1 st No- 

 vember 1830 to 1st November 1831, - 336 



XIV. On the Action of Iodic Acid and of Iodine on Vege- 



table Colours. By Arthur Connell, Esq. 



F. R. S. E. Communicated by the Author, 337 

 XV. Critical Observations on the Ideas of M. Alexander 



Brongniart, relating to the Classification and pro- 

 bable Origin of Tertiary Deposits. By A. 

 Boue', M.D. Concluded from page 172, 340 



XVI. On the Consumption of Gold and Silver in Britain 

 in the Twenty Years between 1810 and 1829, 

 but especially on the application of them to other 

 purposes than Coin. By William Jacob, Esq. 

 F. R.S. - - - - - 34^6 



XVII. On the Utility of Early Elementary Instruction in 



the Natural Sciences, - - - 364 



