210 Proceedings of the Foyal Society of Edinburgh. 



1. On the Sulphuret of Cadmium, a New Mineral (first ob- 

 served by Lord Greenock). By Arthur Connell, Esq. 



2. On an Optical Illusion giving the idea of an Inversion of 

 Perspective in viewing objects through a Telescope. By Pro- 

 fessor Forbes. 



3. Collection of African Shells. Presented by J. O. Mac- 

 William, Esq., Surgeon R. N. 



4. A collection of Fossil Shells, from the great deposit near 

 Uddevalla, in Sweden, presented. 



April 6.— Sir T. M. Brisbane, Bart., G. C. B., Pres., in the 

 Chair. The following Communications were read : — 



1. Notice regarding the Growth of Plants in Close Glazed 

 Cases. By Allan Maconochie, Esq. 



2. Results of Additional Experiments on Terrestrial Mag- 

 netism. By Professor Forbes. 



April 20.— Sir T. M. Brisbane, Bart., G. C. B., Pres., in the 



Chair. The following Communications were made : — 



1. " Sir Charles Bell requested leave to withdraw his paper 

 on the fatal effects of air admitted into the veins of the nech during 

 surgical operations, in order to make additions. 



2. On the Origin and Progress of Grecian Sculpture. By 

 Dr Traill. Part I. 



3. Account of Earthquakes felt in Scotland during the Au- 

 tumn and Winter of 1839. By David Milne, Esq. 



" I. The first part of the paper described the number and in- 

 tensity of the shocks felt between the 3d October 1S39 and 13th 

 April 1840, the point (situated near Comrie) from which they 

 emanated, and the distance to which they extended. 



" II. The next part of the paper was occupied with an account 

 of the effects, both physical and moral, produced by the shocks. 

 Under the first class were described the different kinds of injury 

 done, to walls, according to their direction, and the nature of the 

 ground on which the- were built. Under the second were men- 

 tioned the alarm felt by the inhabitants of Strathearn during the 

 great shock of 23d October, as also the quick preemption of it by 

 the lower animals, and the terror they evinced at it. 



" III. The nature of the movement of the earth's surface which 

 caused the foregoing effects was next noticed, and data were given 

 illustrating the form of the undulation which was produced. The 

 noises also that accompanied the shocks were fully described, and 

 the probable cause of them stated. 



