an index

Like as the sun in a diameter
Fires and inflame the objects removed far
And heateth kindly, shining lat’rally,
So beauty sweetly quickens when tis nigh,
But being separated and removed,
Burns where it cherished, murders where it loved.
Therefore even as an index to a book,
So to his mind was young Leander’s look.

Hero and Leander, 607-614