114 



Monday, Xst February 1847. 



Sir THOMAS M. BRISBANE, Bai-t., President in the 

 Chair. 



The following Communications were read : — 



1. Speculation respecting the origin of Trap-Tuff, the Cause 



of Earthquakes, and of Partial Changes of the Bed of 

 the Ocean. Part I. By Sir G. S. Mackenzie, Bart. 



2. On the Principle of Vital Affinity. Part II. By Dr Ali- 



son. 



The following Gentlemen were duly elected Ordinary Fel- 

 lows : — 



W. Thomson, Esq., Professor of Natural Philosophy in the Uni- 

 versity of Glasgow. 

 J. H. Burton, Esq., Adyocate. 



The following Donations to the Library were announced : — 



On the Volcanoes of the Moon. By James D. Dana. — By the 

 Author. 



Eleventh, Twelfth, and Thirteenth Letters on Glaciers. By Pro- 

 fessor J. D. Forbes. — By the Author. 



Illustrations of the Viscous Theory of Glacier Motion. From the 

 London Philosophical Transactions. By James D. Forbes, 

 F.R.S.S.L. and E. — By the Author. 



Zur Vergleichenden Physiologic der Wii'bellosen Thiere. Von Dr 

 Carl Schmidt. — By the Author. 



Entwurf einer Allgemeinen Untersuchungs Methode der Safte und 

 Excrete des Thiereschen Organismus. Von Carl Schmidt. — 

 By the Author. 



Astronomical Observations made at the Koyal Observatory, Edin- 

 burgh. By the late Thomas Henderson, F.R.S.S.L. and E. 

 Reduced and Edited by his Successor, Charles Piazzi Smyth. 

 Vol. VL, for the year 1840. — By the Astronomical Obser- 

 vatory. 



On the Laws of the Tides on the Coasts of Ireland. By G. B. 

 Airy, F.R.S. — By the Author. 



An Explanation of the Observed Irregularities in the Motion of 



