Stripping an almond tree in flower
The wise apothecary's skill
A single drop of lethal power
From perfect sweetness can distill
From bitterness in efflorescence,
With murderous poisons packed therein;
The poet draws pellucid essence
Pure as a drop of metheglin.
Elinor Morton Wylie
http://www.poemhunter.com/poem/little-joke/