While this famous recipe from Shakespeare's Macbeth sounds like a grisly combination of animal parts, almost all the references are probably to herbs. It has been a longstanding tradition in magic and sorcery to refer to spell components obliquely; often the real recipe resembles very little what the uninitiated conjure in their minds' eye. [Gothic Gardening: The Secret Names of Plants]

Oh, but it is fun to conjure, regardless of Shakespeareâ??s herbal code. It is Halloween, after all.

"Eye of newt and toe of frog,

Wool of bat and tongue of dog,

Adder's fork and blind-worm's sting,

Lizard's leg and howlet's wing,--

For a charm of powerful trouble,

Like a hell-broth boil and bubble."

-- From Macbeth (IV, i,) by William Shakespeare