CONTENTS. 



XVII. On some new Varieties of Fossil Alci/onia. By Thomas Webster, 

 Esq. Member of the Geological Society. p. 377 



XVIII. Miscellaneous Remarks accompanying a Catalogue of Specimens 

 transmitted to the Geological Society. By J. Mac Culioch, M.D. 

 F.R.S. Chemist to the Ordnance, and Lecturer on Chemistry at the 

 Royal Military Academy at Woolwich, and Vice-President of the 

 Geological Society. p. 388 



XIX. Remarks on several parts of Scotland which exhibit Quartz Rocky 

 and on the Nature and Connexion of this Rock in general. By J. 

 Mac CuUocli, il/.i). F.L.S. Chemist to the Ordnance, and Lecturer 

 on Chemistry at the Royal Military Academy at Woolwich^ and Vice- 

 President of the Geological Society. p. 450 



XX. Notice relative to the Geology of the Coast of Labrador. By the 

 Rev. Mr. Steinhauer. p. 488 



XXI. 3Iemorauda relative to Clovely, North Devon, By the Rev. J. J. 

 Conybeare. Member of the Geological Society. In a Letter addressed 



to G. B. Greenough Esq. Vice-President of the Geological Society, p. 495 



XXII. On Slaffa. By J. Mac Culioch, M.D. F.L.S. Chemist to the 

 Ordnance, and Lecturer on Chemistry at the Royal Military Academy 



at Woolwich, and Vice-President of the Geological Society. p. 501 



XXIIT. On Vegetable Remains preserved in Chalcedony. By. J. Mac 

 Culioch, M.D. F.L.S. Chemist to the Ordnance, and Lecturer on 

 Chemistry at the Royal Military Academy at Woolwich^ and Vice- 

 President of the Geological Society. p. 510 



XXIV. On the Vitreous Tubes found near to Dn'gg, in Cumberland. p. 528 



List of Donations. p. 533 



Index. p. 547 



