Enigma

 Enigmas 

are compositions of a different character, based upon ideas , rather than upon words, and frequently constructed so as to mislead, and to surprise when the solution is made known. Enigmas may be founded upon simple catches, like Conundrums, in which form they are usually called Riddles , such as:
"Though you set me on foot,
I shall be on my head."
The answer is, A nail in a shoe . The celebrated Enigma on the letter H, by Miss Catherine Fanshawe, but usually attributed to Lord Byron, commencing:
"'Twas whispered in heaven, 'twas muttered in hell,
And echo caught faintly the sound as it fell;"
and given elsewhere in this volume (See par. 215 , page 77), is an admirable specimen of what may be rendered in the form of an Enigma.