Dibeiizyliciene-~-perseitoI~ is of particular interest to the carbohydrate chemist because its original preparation and accurate analysis by Maquenne:'led to the recognition that D- perseitol (I), discovered in the avocado by Avequin4 in 1831 and long considered to be an isomer of mannitol, is indeed a heptitol. In the present article proofs are
