[Edinburgh? ; c. 1799]. Large 4to, title-page (1 leaf, verso blank) text pps 1-23, inscribed in ink on title “Mr. Thomson From the Author”, uncut, a little dust staining to some deckle edges, modern grey paper boards, printed paper label.
An offprint of a paper read before the Society on 3. December 1798.
“Whinstone” is a term used in the quarrying industry to describe any hard dark-coloured rock. Examples include the igneous rocks basalt and dolerite as well as the sedimentary rock chert. It is common in the Pentland Hills.