15 July 1850 – 21 July 1850

I have not yet been able to collect half a thimbleful of the pollen of the pine on Walden, abundant as it was last summer. There is in our yard a little pitch pine four or five years old and not much more than a foot high, with small cones on it but no male flowers; and yet I do not know of another pitch pine tree within half a mile.