Question: The nursery rhyme that has a Roud Folk Song Index number of 19297 appears in a compilation book illustrated by what author?

Context paragraphs:
Lavender's Blue: "Lavender's Blue" (sometimes called "Lavender Blue") is an English folk song and nursery rhyme dating to the 17th century.  It has a Roud Folk Song Index number of 3483.  It has been recorded in various forms since the 20th century and some pop versions have been hits in the US and UK charts.

A Wise Old Owl: "A Wise Old Owl" is an English language nursery rhyme.  It has a Roud Folk Song Index number of 7734 and in The Oxford Dictionary of Nursery Rhymes, 2nd Ed.  of 1997, as number 394.  The rhyme is an improvement of a traditional nursery rhyme "There was an owl lived in an oak, wisky, wasky, weedle."

This Little Piggy: "This Little Piggy" or "This Little Pig" is an English language nursery rhyme and fingerplay.  It has a Roud Folk Song Index number of 19297.

Three Little Kittens: "Three Little Kittens" is an English language nursery rhyme, probably with roots in the British folk tradition.  The rhyme as published today however is a sophisticated piece usually attributed to American poet Eliza Lee Cabot Follen (1787–1860).  With the passage of time, the poem has been absorbed into the "Mother Goose" collection.  The rhyme tells of three kittens who first lose, then find and soil, their mittens.  When all is finally set to rights, the kittens receive their mother's approval and some pie.  It has a Roud Folk Song Index number of 16150.

Billy Boy: "Billy Boy" is a traditional folk song and nursery rhyme found in the United States.  It has a Roud Folk Song Index number of 326.  It is a variant of the traditional English folk song "My Boy Billy", collected by Ralph Vaughan Williams and published by him in 1912 as number 232 in "Novello's School Songs".  The song is very popular with the Orange Order.

Tweedledum and Tweedledee: Tweedledum and Tweedledee are fictional characters in an English nursery rhyme and in Lewis Carroll's "Through the Looking-Glass, and What Alice Found There".  Their names may have originally come from an epigram written by poet John Byrom .  The nursery rhyme has a Roud Folk Song Index number of 19800.  The names have since become synonymous in western popular culture slang for any two people who look and act in identical ways, generally in a derogatory context.

Cecily Parsley's Nursery Rhymes: Cecily Parsley's Nursery Rhymes is a children's book written and illustrated by Beatrix Potter, and published by Frederick Warne & Co.  in December 1922.  The book is a compilation of traditional nursery rhymes such as "Goosey Goosey Gander", "This Little Piggy" and "Three Blind Mice".  It was Potter's second book of rhymes published by Warne.  Merchandise generated from the tale includes Beswick Pottery porcelain figurines and Schmid music boxes.

Did You Ever See a Lassie?: "Did You Ever See a Lassie?"  is a folk song, nursery rhyme, and singing game.  It has a Roud Folk Song Index number of 5040.

Aiken Drum: "Aiken Drum" is a popular Scottish folk song and nursery rhyme, which probably has its origins in a Jacobite song about the Battle of Sheriffmuir (1715).  It has a Roud Folk Song Index number of 2571.

Row, Row, Row Your Boat: "Row, Row, Row Your Boat" is an English language nursery rhyme and a popular children's song.  It can also be an "action" nursery rhyme, whose singers sit opposite one another and "row" forwards and backwards with joined hands.  It has a Roud Folk Song Index number of 19236.

Supporting paragraphs: Cecily Parsley's Nursery Rhymes This Little Piggy
Answer: Beatrix Potter