Mr. Beaver knew because Lucy mentioned how Edmund had been in Narnia but hadn't known where he'd been. When they started talking about the prophesy Edmund sneaked out of the beaver dome and went to the castle. When the hounds showed up trying to break in Beaver knew he had gone to the The witch's castle.
It should be that the word gray represents barrenness and the word bare refers to emptiness as their literal interpretation. As used in the modernist poetry, the jar connotes modern life in the midst of hollowness.</span>
