VICINITY of EDINBURGH. 43% 
19th March. 
Since I had the honour of reading the foregoing paper to 
the Society, a {trong cafe in illuftration of what is mentioned 
in the commencement of it, has prefented itfelf; I mean, with 
refpect to the conftant occurrence of new and interefting mat- 
ter, even in the moft frequented ground. 
A Frew days ago, Profeffor PLayrair mentioned to me, that 
- by the cutting down of a fection of the Craig, within: thirty 
paces of the fouthern extremity, feveral maffes of fandftone 
had made their appearance, imbedded in the greenftone. I 
loft no time in vifiting the fpot, and was greatly pleafed to find, 
a confiderable addition to the interefting facts, already exhibit- 
ed on Salifbury Craig. 
At this part of the rock, the greenftone becomes very thin, 
being no more than twenty to twenty-five feet thick ; it has the 
appearance, however, of having once been of greater extent, 
the upper part being apparently cut away by fome operation of 
nature, of which we have now only to obferve the effects. It 
flopes rapidly towards the fouth, and is covered to a confider- 
able depth with foil and travelled ftones. It is at the upper 
furface of this, that the imbedded mafles occur; they appear 
to be portions of ftrata, which obferve the general inclination 
of the fandftone of Salifbury Craig, that is, dipping towards 
the north-eaft, while the expofed fections are parallel to each 
other, and nearly horizontal; confequently, being near the fur- 
face, they are cut off, or crop out, on the fouth fide. Their 
; appearance, 
