A drawing of the -now lost- Coilsfield (Ayrshire) cist cover by Col. Hugh Montgomery of Shielmorly was presented to the Royal Society of Edinburgh in 1785.
Simpson (1866), Munro (1899) and Morris (1986) copied this and eachothers draws.
So Mr Langlands stood at Old Bewick -the craddle of rock art- in the 1820s.
By that time Col. Montgomery's drawing of the Coilsfield slab was in the archives in Edinburgh for about 35 years!
Cheers,
Jan