Classic Poem

[1]

Should you chance to suffer thirst
Turn my second to my first
My whole is in the garden dug
And may be fairly called a drug
C.E.A.

[2]

My 1 st is a hindrance, my 2 d a snare
With nothing between them I boldly declare;
My whole is a title, sometimes the reward
Of Value, or Science, but it is not a Lord.
C.E.A.