Have you ever _seen_ a "spring peeper" peeping? You will hear, these spring nights, many distinct notes in the marshes, and when you have seen all of the lowly musicians you will be a fairly accomplished naturalist. Let the discovery of "Who's Who among the Frogs" this spring be one of your first outdoor studies. The picture shows you Pickering's hyla, blowing his bagpipe. _Arbutus_: trailing arbutus (_Epigæa repens_), sometimes called ground-laurel, and mayflower, fishflower (in New Jersey).
_hepatica_: liver-leaf (_Hepatica triloba_).
_Spice-bush_: wild allspice, fever-bush, Benjamin-bush (_Benzoin æstivale_).
_Wood-pussy_: the skunk, who comes out of his winter den very early in spring, and whose scent is one of the characteristic odors of a New England spring.
_All white and still_: The whole poem will be found on the last page of "Winter," the second book in this series.
_trillium_: the wake-robin. Read Mr. Burroughs's book "Wake-Robin,"--the first of his outdoor books.
_phoebe_: See the chapter called "The Palace in the Pig-Pen."
_bloodroot_: _Sanguinaria canadensis_. See the picture on this page. So named because of the red-orange juice in the root-stalks, used by the Indians as a stain.
_marsh-marigolds_: The more common but _incorrect_ name is "cowslip." The marsh-marigold is _Caltha palustris_ and belongs with the buttercup and wind-flower to the Crowfoot Family. The cowslip, a species of primrose, is a European plant and belongs to the Primrose Family.
_woolly-bear_: caterpillar of the isabella tiger moth, the common caterpillar, brown in the middle with black ends, whose hairs look as if they had been clipped, so even are they.
_mourning-cloak_: See picture, page 77 of "Winter," the second book of this series. The antiopa butterfly.
_juncos_: the common slate-colored "snowbirds."
_witch-hazel_: See picture, page 28 of "The Fall of the Year"; read description of it on pages 31-33 of the same volume.
_bluets_: or "innocence" (_Houstonia coerulea_).
_the Delaware_: the Delaware River, up which they come in order to lay their eggs. As they come up they are caught in nets and their eggs or "roe" salted and made into caviar.
_Cohansey Creek_: a small river in New Jersey.