Read it through once

We went to the Milk Grotto, of course--a cavern where Mary hid herself for a while before the flight into Egypt. Its walls were black before she entered, but in suckling the Child, a drop of her milk fell upon the floor and instantly changed the darkness of the walls to its own snowy hue. We took many little fragments of stone from here, because it is well known in all the East that a barren woman hath need only to touch her lips to one of these and her failing will depart from her. We took many specimens, to the end that we might confer happiness upon certain households that we wot of.