onn el ▁( 1 7 4 6 / 7 – 1 8 2 0 ) ▁was ▁a ▁Scottish ▁anti qu arian . ▁ ▁Life ▁He ▁was ▁the ▁sole ▁surv iving ▁son ▁of ▁Mans feld t ▁de ▁Card onn el ▁of ▁M uss el burgh , ▁a ▁commission er ▁of ▁the ▁custom s ▁and ▁salt ▁duties ▁in ▁Scotland , ▁and ▁his ▁wife ▁Anne , ▁daughter ▁and ▁he ir ▁of ▁Thomas ▁Hil ton ▁of ▁Low ▁Ford , ▁County ▁Dur ham . ▁He ▁was ▁a ▁grand ne p hew ▁of ▁Adam ▁de ▁Card onn el , ▁secretary ▁to ▁the ▁Duke ▁of ▁Mar l borough . ▁ ▁Card onn el ▁was ▁educated ▁for ▁the ▁medical ▁profession , ▁and ▁pract ised ▁for ▁a ▁while ▁as ▁a ▁sur geon . ▁When ▁the ▁Society ▁of ▁Anti qu aries ▁of ▁Scotland ▁was ▁founded ▁in ▁December ▁ 1 7 8 0 , ▁he ▁was ▁elected ▁a ▁fellow ; ▁he ▁also ▁served ▁as ▁cur ator ▁from ▁ 1 7 8 2 ▁to ▁ 1 7 8 4 . ▁ ▁When ▁Francis ▁Gro se ▁visited ▁Scotland , ▁Card onn el ▁assist ed ▁him . ▁In ▁the ▁aut umn ▁of ▁ 1 7 8 9 ▁Robert ▁Burn s ▁addressed ▁a ▁letter ▁to ▁Gro se ▁and ▁en closed ▁the ▁letter ▁under ▁cover ▁to ▁Card onn el ▁at ▁Edinburgh , ▁with ▁his ▁imp rom pt u ▁Ken ▁ye ▁ought ▁o ' ▁Captain ▁Gro se ?. ▁ ▁Card onn el ▁left ▁Scotland ▁on ▁succeed ing ▁to ▁the ▁est ates ▁of ▁his ▁second ▁cousin ▁Hil ton ▁Law son ,