1911 Little Willies Book, No. X

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Little Willie had a mirror,
  And he licked the back all off,
Vainly thinking, in his terror,
  It would cure the whooping-cough.
At the fun’ral said his mother
  To her neighbor, Mrs. Brown,
  “‘Twas a chilly day for Willie
   When the mercury went down.”

An obvious rewrite of one of the earliest “Little Willies” published as early as 1895.