From O.Henry short story "The Harbinger":
The warble of the first robin in Hackensack, the stirring of the maple sap in Bennington, the budding of the pussy willows along Main Street in Syracuse, the first chirp of the bluebird, the swan song of the Blue Point, the annual tornado in St. Louis, the plaint of the peach pessimist from Pompton, N. J., the regular visit of the tame wild goose with a broken leg to the pond near Bilgewater Junction, the base attempt of the Drug Trust to boost the price of quinine foiled in the House by Congressman Jinks, the first tall poplar struck by lightning and the usual stunned picknickers who had taken refuge, the first crack of the ice jam in the Allegheny River, the finding of a violet in its mossy bed by the correspondent at Round Corners - these are the advance signs of the burgeoning season that are wired into the wise city, while the farmer sees nothing but winter upon his dreary fields.

The Blue Point oyster was named for Blue Point, Long Island in New York, where this exceptionally fine oyster was first discovered. The name is now generally used for any medium size Atlantic oyster eaten raw.


I'm not sure what "the swan song" refers to. There are
months in which eating shellfish is hazardous because
of microscopic organisms (dinoflagellates) that are very toxic, but I think that happens only in warm water later in the year.