Thoreau writes in his journal:
2 P.M.—Thermometer 4 [sic]. To Second Division Brook . . .
The Second Division Spring is all covered with a brown floating gelatinous substance of the consistency of frog-spawn, but with nothing like spawn visible in it. It is of irregular longish, or rather ropy, form, and is of the consistency of frog-spawn without the ova. I think it must be done with. It quite covers the surface . . .
