Pare and cut into quarters the peaches, put with the powdered sugar into a dish and let them stand 2 hours; also add the peach pits (after they have been scalded and freed from their brown skin); soak the gelatine in 3/4 cup cold water for 15 minutes, add 3/4 cup boiling water and stir over the fire till melted; strain and set aside to cool; press the peaches through a sieve, add gelatine and pits and stir till it begins to thicken; then carefully stir in the whipped cream, turn into a form and place for 2 hours on ice.