[The Graefe memorial stone--in memory of A. von Graefe's contributions in Heiden].

Between 1859 and 1869, Albrecht von Graefe used to spend some weeks in September in Heiden, a small health resort in Eastern Switzerland. During his "holidays", however, the hotel "Freihof", where he lived, was transformed into a most active unit of ophthalmic surgery. A memorial stone, rediscovered and restored thanks to the endeavour of Professor Peter Speiser of St. Gallen, remembers this episode, which was of some importance not only for local tourism, but also for the young Swiss ophthalmology of the time.