P. M. - To Walden and Fair Haven Ponds and down river.
It snowed slightly this morning, so as to cover the [ground] half an inch deep. Walden is frozen over, apparently about two inches thick. It must have frozen, the whole of it, since the snow of the 18th, - probably the night of the 18th. It is very thickly [covered with] what C. calls ice-rosettes, i. e. those small pinches of crystallized snow, - as thickly as if it had snowed in that form. I think it is a sort of hoar frost on the ice. It was all done last night, for we see them thickly clustered about our skate-tracks on the river, where it was quite bare yesterday.