Spider-foot, toad's-belly, too, Give the child, and Winglet!
"Faust"
Goethe
The fluid which has been stored up in the pupa enters the Winglet at the opening referred to, expanding the membranes as it passes along between them, and the nervures at the same time, and when it has extended to every portion of the wing, then it is fully expanded.
"Butterflies Worth Knowing"
Clarence M. Weed