"I do not imagine that Mr. Black's researches at this time (or perhaps at any time) have been keen or pertinacious. This could not accord with the native gentleness of his mind; but his conceptions being distinct, and his judgment sound, his progress in scientific research, if slow, was steady, and his acquisitions were solid. Perhaps this moderation and sobriety of thought was his happiest disposition, and the most conducive to his improvement."