Professor E. Forbes on the Oolite in Skye. 101 



lations in age of the igneous with the stratified rocks of the 

 Hebrides, and of the physical and vital phenomena deter- 

 mined by the several eruptions within their area, will sooner 

 or later be one of the most delightful and best rewarded 

 tasks to which a competent observer can apply. 



The following is a list of the fossils collected at Loch 

 Staffin by Professor E. Forbes, and of the new species dis- 

 covered, figured, and described by hira in his Memoir in the 

 Quarterly Journal of the Geological Society for May 1851. 



1. Oxford Clay, 

 1. Ammonites cordatus, Sowerby, 2. Ammonites Eugenii, 

 Baspail. 3. Ammonites Vernoni, Phillipa (?), possibly a 

 variety of A. biplex. 4. Ammonites, fragment of a species 

 nearly allied to A. zignodensis of Alcide D^OrUgny. 5. Belem- 

 nites Owenii, Fratt. 



2. Staffin Estuary Shales. 

 1. Rissoa (Hydrobia) conulua. Paludina conulus of 

 Robertson. 2. Neritina Stafiinensis. 3. Ostrea Hebridica. 

 4. Perna Murchisonii. 5. Trigonia tripartita. 6. Unio (?) 

 Staffinensis. 7. Cyrena Jamesonii. 8. Cyrena Arata. 9. 

 Cyrena Cunninghami. 10. Cyrena MacCuUochii. 11. 

 Potamomya (?) Sowerbii. 12. Potamomya (?) Sedgwickii. 



Physical Demonstration of the Earth! s Motion of BotatioUy by 

 means of the Pendulum. By M. L. FOUCAULT. 



The rotation of the earth around its axis is one of those 

 physical truths which appear too incontestable for any one 

 to venture to call in question. Notwithstanding this, we 

 have indirect proofs only of its existence ; some of these are 

 derived from the apparent movement of the sun and of the 

 vault of the heavens, others from the existence of centrifugal 

 force, and others from the flattened form of the terrestrial 

 globe at the poles, &c. To these proofs M. Leon Foucault 

 has just added a new direct one of such kind as to convince 

 the most incredulous, if any such still exist, for he has suc- 

 ceeded in rendering the rotation of the earth as evident to 

 the sight as that of a spinning-top. In anticipation of our 



