Why Wouldn’t Castor Oil Inspire Poetry?

In the patent medicine advertisement from Wemple & Company, New York, circa 1800s, a boy calmly receives a spoonful of Scott & Bowne’s Palatable Castor Oil from his smiling mother. His little sister raises her arms (in excitement?), abandons her toys and awaits her turn. The punctuation-free copy reads,

“See how these children take and ask for more
Of the same oil they sickened at before
What no one young or old could once endure
Now tastes pleasant sweet and pure.”

This image is from NLM’s Prints and Photographs collection.