Thoreau surveys a lot south of Walden Pond “known in 1746 as Samuel Heywoods ‘pasture’” for, and accompanied by, Ralph Waldo Emerson (A Catalog of Thoreau’s Surveys in the Concord Free Public Library, 7; Henry David Thoreau papers. Special Collections, Concord (Mass.) Free Public Library).  
 
See entry 18 April.