Break anounce of isinglass small, and pour on it a teacup of hot milk or water; let it dissolve, then strain it through muslin, on half a pound of fine white sugar. When nearly cold add to it aquart of rich cream, already beaten to a froth; continue to beat it for a few minutes, holding the pan on ice. Line your mould with sponges and pour your cream in. Cover with sponge cake or lady fingers. Turn it out and serve. The isinglass will make this very firm if held on ice long enough to solidify before serving.