Certain winged and mailed denizens of the field seem to reach their heyday along with the plants they most affect. In June the leaning towers of the white milkweed are jeweled over with red and gold beetles, climbing dizzily. This is that milkweed from whose stems the Indians flayed fibre to make snares for small game, but what use the beetles put it to except for a displaying ground for their gay coats, I could never discover. The white butterfly crop comes on with the bigelovia bloom, and on warm mornings makes an airy twinkling all across the field. In September young linnets grow out of the rabbit-brush in the night. All the nests discoverable in the neighboring orchards will not account for the numbers of them. Somewhere, by the same secret process by which the field matures a million more seeds than it needs, it is maturing red-hooded linnets for their devouring. All the purlieus of bigelovia and artemisia are noisy with them for a month. Suddenly as they come as suddenly go the fly-by-nights, that pitch and toss on dusky barred wings above the field of summer twilights.  Never one of these nighthawks will you see after linnet time, though the hurtle of their wings makes a pleasant sound across the dusk in their season.