June 13.

Friday. To Worcester.

See the common iris in meadow in Acton. 

Brown shows me from his window the word “guano” written on the grass in a field near the hospital, say three quarters of a mile distant. It was one of the lions of Worcester last year, and I can now read some of the letters distinctly, so permanent are the effects of the guano. The letters may be two or more rods long, and the green is darker and more luxuriant. (On the side of a hill.)

H. D. Thoreau, Journal, June 13, 1856