According to the 1873 Guide to the Church this memorial was originally sited in the North Transept, an area now largely occupied by the organ. The memorial remains in situ behind the organ.
Memorial
(From the 1873 Guide)
SACRED TO THE MEMORY OF LIEUT. HENRY WEMYSS, 21ST ROYAL NORTH BRITISH, FUSILIERS, YOUNGEST SON OF THE LATE COLONEL WEMYSS, OF WEMYSSHALL, FIFESHIRE, N.B., WHO DIED ON THE 27TH OCTOBER, 1832, AGED 19 YEARS. BRIEF AND LOVELY WAS HIS SPAN OF LIFE, HIS YOUTH WAS FULL OF FAIR PROMISE, HE WAS BELOVED BY ALL WHO KNEW HIM, AND TO HIS MOTHER, BY WHOM THIS SAD MONUMENT IS RAISED, HE NEVER CAUSED GRIEF UNTIL HIS DEATH.