INDEX. 



Page 



Thomson, Dr Thomas^ his Chemical Analysis of a Spe- 

 cimen of Magnetic Iron- Ore 

 from Greenland, - ii. 51 



his description and Analysis of 



a new Species of Lead-Ore 

 from India, - 252 



Tinto, Mineralogical description of, by Dr Macknight, 123 

 Topaz of Scotland, Professor Jameson on the, i, 44)5.-— 



Addition, 628. 

 Trachea of Birds, of importance in discriminating the 

 Species, Note, i. 184. — Account of a Species of 

 Fasciola inhabiting the Trachea of Poultry, 194, 199* 



Transition Greenstone of Fassney described, - i. 126 



Rocks of the Pentlands described, - ii. 183 



Conglomerated Rocks described, - 206 



Trap of the Campsie Hills, - 27 



Tuff near St Andrew's, * 152 



Professor Jameson's description of - 209 



— in the Middle District of Scotland, - 630 



Trigla laevis, observations on, ii. 455, — T. cuculus, 457. 



— T. lineata, 460. 



Tuff of the Ochils described, - 14 



Claj^stone of the Pentlands, - 198 



Tyndrum, Mineralogy of the neighbourhood of -» i. 307 



V 



Vauquelin and Klaproth, their Analysis of Cryolite, 4*66 



Veins, On Cotemporaneous, by Professor Jameson, i. 1. 

 — Description of true Veins, ib. — Of Cotempo- 

 raneous Veins, 2. — Why termed Cotemporane- 

 ous, 3. — Occur in every Mountain Rock, ib. — 

 Composition frequently distinct from that of the 

 Rock in which they are contained, 4. — Remarks 

 on some peculiarities in the opening of, 5, 6. 



