I observe, as usual, the shore heaved up near where my house was. It is evidently the result of its thawing. It is lifted up with a n abrupt, nearly perpendicular edge nearly a foot high (but looks as if it had been crowded up by the ice), while the part under water probably has not been frozen, or has not been thawed. But in the water close to the shore I observe singular dimples in the sand, sometimes perfectly circular tunnels, etc., as if a stone had been turned round and round and then lifted out. Perhaps this ridge thus lifted up remains somewhat loose through the summer, not falling entirely back, and the next winter, therefore, freezes yet deeper and is heaved up yet higher, and so gains a little from year to year. Thus a pond may create a barrier for itself along an adjacent meadow. When it thus lifts up the shore, it lifts the trees with it, and they are upset.