This makes the fifth kind of frog or toad spawn that I have detected this year..

May 9. 

P. M. – To Holden and to Ledum Swamp. 

See two Rana halecina. They have the green halo, but are plain brown between the spots on the back and not vivid light-green like the one of May 4th. 

See in Ludwigia palustris ditch on Hubbard’s land evidently toad-spawn already hatched, or flatted out. I distinguish the long strings, now straighter than usual and floating thin on the surface. It is less obvious than frog-spawn, and might easily be overlooked on a slimy surface. I can distinguish the little pollywog while yet in the ova by their being quite small and very black. 

This makes the fifth kind of frog or toad spawn that I have detected this year.

See, in the Holden Swamp wood, the bird of May 3d. It has sly and inquisitive ways, holding down its head and looking at me at some distance off. It has a distinct white line along the bill and about the eyes, and no yellow there, as is said of the white-eyed vireo, and I am now inclined to think it the solitary vireo (?), whose song is not described, and which is considered rare. I should say it had a blue-slate head, and, I note, a distinct yellowish vent, which none of the vireos are allowed to have!! The sides of the body are distinctly yellow, but there is none at all on the throat or breast. 

Vaccinium Pennsylvanicum, – how long? — by owl nest tree. 

Sylvia Americana

The parti-colored warbler is very common and musical there, — my tweezer-bird, – making the screep screep screep note. It is an almost incessant singer and a very handsomely marked bird. It frequents the spruce trees, at regular intervals pausing as it flits, hops, and creeps about from limb to limb or up the main stem, and holding up its head, utters its humble notes, like ah twze twze twze, or ah twze twze twze twze.

I notice very large clams, apparently the Unio complanatus (vide two specimens in drawer), or common, in West Meadow Brook near the road, one more than four and a half inches long. I have before seen them very large in brooks. 

A dandelion perfectly gone to seed, a complete globe, a system in itself. 

My Rana palustris spawn, laid in house May 5th, in the sun this afternoon swells and rises to the surface in the jar, so that the uppermost ova project slightly above it.

H. D. Thoreau, Journal, May 9, 1858

The fifth kind of frog or toad spawn. See note to May 6, 1858 (Frogs of Massachusetts)

The parti-colored warbler — my tweezer-bird. See May 18, 1856 ("A Sylvia Americana, — parti-colored warbler, — in the Holden Wood, sings a, tshrea tshrea tshrea, tshre’ tshritty tshrit’." and note to May 13, 1856 ("The tweezer-bird or Sylvia Americana. . . . the parti-colored warbler, and was that switter switter switter switter swit also by it?.”) See also A Book of Seasons,  by Henry Thoreau, The Parti-Colored (Parula) Warbler (Sylvia Americana)

The bird of May 3d. . . . I am now inclined to think it the solitary vireo. See May 3, 1858.("See and hear a new bird to me. At first it was silent, and I took it for the common pewee, but, bringing my glass to bear on it, found it to be pure white throat and beneath, yellow on sides of body or wings, greenish-yellow back and shoulders, a white or whitish ring about eyes, and a light mark along side of head,
two white bars on wings, apparently black bill and dark or perhaps slate-colored (?) wings and above tail. It surprised me by singing in a novel and powerful and rich strain.")