Richard Tyrwhitt, A handbook of pictorial book, Clarendon Press Oxford, 1868, p.361

…into the land he occupies in a raid like a Northern invader or mountaineer ; and the question arises, whether he came down with the stream he now lives by, when it was stronger; or if he rolled down the hill side suo Marte; or if he is a trace of tha ancient incursion of some great glacier Many a day he has been quiet, however, and been a settled and not a rolling stone. So he has gathered moss; and the heather and briars and young ash saplings have grown round him, though the sheep have nibbled them rather ; and we suppose a small trout lives under him in the shadow and that the ouzels come down and dip about him after caddis worms ; he is a piece of the far hills, but they do not miss him; like the Skyeman Mac Rimmon ‘ he returns no more-no more-no more’.