Liquid but corporeal substances become surrounded by some kind of covering on heating, like the solid scum which forms on boiled foods when cooling.
(Liquid but corporeal substances; become surrounded; by some kind of covering on heating, like the solid scum) (the solid scum; forms; on boiled foods; T:when cooling)
Liquid but corporeal substances the solid scum
become surrounded forms
by some kind of covering on heating, like the solid scum
on boiled foods T:when cooling