One year I went across the middle only five days before it disappeared entirely. In 1845 Walden was first completely open on the 1st of April; in ’46, the 25th of March; in ’47, the 8th of April; in ’51, the 28th of March; in ’52, the 18th of April; in ’53, the 23rd of March; in ’54, about the 7th of April.