A fine example of this is a smiling Henry de la Beche
, (founder of The Geological Survey) grinning happily in the company of two of his grandchildren, coincidentally Mary's niece and nephew.
With his personally purchased compass and theodolite, Logan began to make detailed geologic maps of the area using the one-inch sheets of the Ordnance Survey as a base (Bailey 1952), maps that Sir Henry De la Beche
later adopted as official documents of the Geological Survey of Great Britain (Smith 2000).
Among the many original features in Hendrefoilan House are fine, stained-glass windows which commemorate the Dillwyn and De la Beche families, created after LL Dillwyn married the daughter of geologist Henry De la Beche