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270 they were absolutely undiscoverable. They no longer stood out around the core, so delicate was their organization. It made me doubt almost if there were not actual, substantial, though invisible cores to the leaflets and veins of the hoar frost. Can these almost invisible and tender fibres penetrate the earth where there is no cavern? Or is what we call the solid earth porous and cavernous enough for them?

March 29, 1855. As I stand on Heywood's Peak looking over Walden, more than half its surface already sparkling blue water, I inhale with pleasure the cold but wholesome air, like a draught of cold water, contrasting it in my memory with the wind of summer which I do not thus eagerly swallow. This, which is a chilling wind to my fellow, is decidedly refreshing to me. I swallow it with eagerness as a panacea. I feel an impulse also already to jump into the half-melted pond. This cold wind is refreshing to my palate as the warm air of sunshine is not, methinks.

March 29, 1858 To Ball's Hill As I sit two thirds up the sunny side of Pine. Hill looking over the meadows, now almost completely bare, the crows, by their swift flight and scolding, reveal to me some large bird of prey hovering over the river. I perceive by its marking and size that it cannot be