forms eddying whirlpools one part of which are due to the impetus of the principal current and the other to the incidental motion and return flow.
[Footnote: See Pl. XXV. Where also the text of this passage is given in facsimile.]
On draperies (390—392).
390.
OF THE NATURE OF THE FOLDS IN DRAPERY.
That part of a fold which is farthest from the ends where it is confined will fall most nearly in its natural form.
Every thing by nature tends to remain at rest. Drapery, being of equal density and thickness on its wrong side and on its right, has a tendency to lie flat; therefore when you give it a fold or plait forcing it out of its flatness note well the result of the constraint in the part where it is most confined; and the part which is farthest from this constraint you will see relapses most into