The weeds are as indispensable to the fishes as woods and shrubbery to us. I saw a perch conceal himself from my sight under a tuft of weeds at the bottom not much wider than its own length. That potamogeton (is it P. Robbinsii?) growing in dense beds under water, all immersed in shallow places, like a bed of brown and muddy ostrich-feathers, alternating with darker beds of Bidens Beckii, which show but a particle of green above the surface (I think of the latter in the South Branch), - what concealment these afford to turtles, frogs, fishes, etc.,! The potamogetons are so thick in some places in the main stream that a frog might hop quite across the river on them without getting in over his head.