The Salix alba begins to leaf.

April 24.

P. M. — To Flint’s Pond. 

Warm and quite a thick haze. Cannot see distant  hills, nor use my glass to advantage. 

The Equisetum arvense on the causeway sheds its green pollen, which looks like lint on the hand abundantly, and may have done so when I first saw it upon the 21st. 

Young caterpillars’ nests are just hatched on the wild cherry. Some are an inch in diameter, others just come out. The little creatures have crawled at once to the extremity of the twigs and commenced at once on the green buds just about to burst, eating holes into them. They do not come forth till the buds are about to burst. 

I see on the pitch pines at Thrush Alley that golden crested wren or the other, ashy-olive above and whitish beneath, with a white bar on wings, restlessly darting at insects like a flycatcher, —into the air after them. It is quite tame. A very neat bird, but does not sing now. 

I see a bee like a small bumble-bee go into a little hole under a leaf in the road, which apparently it has made, and come out again back foremost. 

That fine slaty-blue butterfly, bigger than the small red, in wood-paths. 

I see a cone-bearing willow in dry woods, which will begin to leaf to-morrow, and apparently to show cones. 

Pyrus arbutifolia will begin to leaf to-morrow. Its buds are red while those of the shad-bush are green.

I can find no red cedar in bloom, but it will undoubtedly shed pollen to-morrow. It is on the point of it. I am not sure that the white cedar is any earlier. The sprigs of red cedar, now full of the buff-colored staminate flowers, like fruit, are very rich. 

The next day they shed an abundance of pollen in the house. It is a clear buff color, while that of the white cedar is very different, being a faint salmon. It would be very pleasant to make a collection of these powders,—like dry ground paints. They would be the right kind of chemicals to have. 

I see the black birch stumps, where they have cut by Flint’s Pond the past winter, completely covered with a greasy-looking pinkish-colored cream, yet without any particular taste or smell,—what the sap has turned to. 

The Salix alba begins to leaf. 

Have not seen the F. hyemalis for a week.

H. D. Thoreau, Journal, April 24, 1855

Black birch stumps . . . cut by Flint’s Pond the past winter, . .. covered with a greasy-looking pinkish-colored cream.  See June 29, 1854 ("All the large black birches on Hubbard's Hill have just been cut down, — half a dozen or more. The two largest measure two feet seven inches in diameter on the stump at a foot from the ground; the others, five or six inches less. The inner bark there about five eighths of an inch."). . See also  April 23, 1856 ("The white birch sap flows yet from a stump cut last fall, and a few small bees, flies, etc., are attracted by it.")

Young caterpillars’ nests are just hatched on the wild cherry. See April 24, 1856 ("old caterpillar-nests which now lie on the ground under wild cherry trees . . .”)

I see on the pitch pines at Thrush Alley that golden crested wren or the other. (probably the ruby-crowned kinglet) See May 7, 1854 ("A ruby-crested wren. . .Saw its ruby crest and heard its harsh note. (This was the same I have called golden-crowned . . . except that I saw its ruby crest.. ..Have I seen the two?)”) May 6, 1855 ("Hear at a distance a ruby(?)-crowned wren, . . . I think this the only Regulus I have ever seen.”);  December 25, 1859 ("I hear a sharp fine screep from some bird,. . . I can see a brilliant crown. . . . It is evidently the golden-crested wren, which I have not made out before.”)