Was it a vireo I heard this forenoon?

April 19. 

April 19, 2019

Was it a vireo I heard this forenoon on the elms? 

Channing sees the same small flock of sheldrakes, three birds, in Walden still. They have been there a week or two, but I cannot see them the 22d. 

P. M. — Began to set white pines in R.W.E.'s Wyman lot.

H. D. Thoreau, Journal, April 19, 1859

Was it a vireo I heard this forenoon? See May 3, 1858 ("Yet it may be the white-eyed vireo (which I do not know), if it comes so early. Nuttall says it comes to Cambridge about the middle of April”) and May 9, 1858 ("I am now inclined to think it the solitary vireo.”)

The same small flock of sheldrakes, three birds, in Walden still. See April 16, 1859 ("Sheldrakes yet on Walden. . . — three or more.”).See also Henry Thoreau, A Book of the Seasons, The Sheldrake (Merganser, Goosander)

Began to set white pines. See  April 21, 1859 (" Setting pines all day. This makes two and a half days, with two men and a horse and cart to help me. We have set some four hundred trees at fifteen feet apart diamondwise, covering some two acres. I set every one with my own hand"); April 22, 1859 ("When setting the pines at Walden the last three days, I was sung to by the field sparrow.")

Wyman lot. See December 9, 1856 (“From a little east of Wyman's I look over the pond westward. The sun is near setting, away beyond Fair Haven. A bewitching stillness reigns through all the woodland and over the snow-clad landscape. Indeed, the winter day in the woods or fields has commonly the stillness of twilight. The pond is perfectly smooth and full of light.”)