_Mode_.?Put the cream into a _lined_ saucepan with the sugar,
lemon-peel, and isinglass, and simmer these over a gentle fire for about
10 minutes, stirring them all the time. Strain the cream into a jug, add
the yolks of eggs, which should be well beaten, and put the jug into a
saucepan of boiling water; stir the mixture one way until it thickens,
_but do not allow it to boil_; take it off the fire, and keep stirringit until nearly cold.