from the LINK (click here where the letters are a different color, yes the left button on the mouse) already posted in the first entry in this thread...

A dactyl, as you may know, is a poetic foot of the form >-- (ON-off-off). For example, interstate, realize, microphone, cereal, limerick, etc. etc. A double dactyl, naturally enough, is two dactyls in a row.

A double dactyl is also a poem, a form invented by Anthony Hecht and Paul Pascal. Quite like a limerick, it has a rigid (if peculiar) structure. Two stanzas, each comprising three lines of dactylic dimeter followed by a line with a dactyl and a single accent. The two stanzas have to rhyme on their last line. The first line of the first stanza is repetitive nonsense. The second line of the first stanza is somebody's name -- strictly speaking, a proper noun. Note that this name must itself be double-dactylic. E.g. Gloria Vanderbilt, Jesus of Nazareth, Gilbert and Sullivan, Archangel Gabriel. In the second stanza, one entire line must be a double-dactylic word. E.g. biopsychology

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Albatross Balbatross
Baron von Richthofen
Chased a Canadian
Down to the deck

There at such altitudes
Acrodendrophilous
Double-A gunners soon
Blew him to heck