VICINlTr of EDINBURGH. 433 



greenftone. The fpecimen No. 79. fhews a portion of the 

 •fandftone, with that fubflance traverfing its flratified lines dia- 

 gonally. No. 80. is a mafs of the fandftone, containing a 

 fmall portion of greenftone, much of the fame fhape as the 

 double wedge of St Leonard's Hill, and formed, as I conceive, 

 exactly in the fame manner. This wedge, on one fide of the 

 fpecimen, is two inches long, but, on the oppofite, it is not 

 one; and in the counter part of the fame fpecimen, (No. 81.) 

 it is only to be feen on one furface ; it does not penetrate to the 

 other fide, though fcarcely an inch thick. 



I am glad to find, that intereft has been made to prevent 

 this valuable fet of facts from being foon deflroyed, as, in a 

 few weeks, the rock in which thefe are contained would have 

 been broken down, and carried off for the repair of the neigh- 

 bouring roads. 



It is on this account, that much activity is requifite to keep 

 thefe perifhable phenomena from being loft, in the neighbour- 

 hood of fuch a town as Edinburgh. Similar things are pre- 

 fenting themfelves conftantly, but they are opened only for a 

 day, and if not feized and recorded on the inftant, will be fhut 

 up, and loft for ever. 



END OF THE SIXTH VOLUME. 



