OF EAST LOTHIAN. 473 



In proposing to lay before the Society, an ac- 

 count of the veins which occur in the trap forma- 

 tion of East Lothian, it was more with the inten- 

 tion of completing the task I had undertaken, than 

 with the expectation of much important result, or 

 any great variety of observation. When it is con- 

 sidered, that the result of the universal formation 

 cannot include veins derived from any of the 

 other great universal formations, this part of my 

 subject must necessarily be very much circum- 

 scribed ; so that, in reality, we cannot expect any 

 of those repositories in this formation, (consider- 

 ing its relative age to be established), but what 

 may be mentioned under the three following 

 heads : ist, Veins derived from subsequent partial 

 formations, which, however, are of unfrequent oc- 

 currence ; id, Veins of the different rocks of the 

 formation, penetrating the older beds ; and, 3^, 

 Those of coternporaneous origin. 



Without deciding at present to which of these 

 classes the veins which occur in the East Lothian 

 trap rocks belong, I shall enumerate the minerals, 

 and then treat of each very briefly. 1. Green- 

 stone ; 2. Jaspers \ 3. Quartz ; 4. Heavy-spar ; 

 5« Calc-spar. 



