Th' Ascidian tadpole, young and gay,
Doth Life with one bright eye survey,
His consciousness has easy play.
He's sensitive to grief and pain,
Has tail, and spine, and bears a brain,
And everything that fits the state
Of creatures we call vertebrate.
But age comes on; with sudden shock
He sticks his head against a rock!
His tail drops off, his eye drops in,
His brain's absorbed into his skin;
He does not move, nor feel, nor know
The tidal water's ebb and flow,
But still abides, unstirred, alone,
A sucker sticking to a stone.

And we, his children, truly we
In youth are, like the Tadpole, free.
And where we would we blithely go,
Have brains and hearts, and feel and know.
Then Age comes on! To Habit we
Affix ourselves and are not free;
Th' Ascidian's rooted to a rock,
And we are bond-slaves of the clock;
Our rocks are Medicine--Letters--Law,
From these our heads we cannot draw:
Our loves drop off, our hearts drop in,
And daily thicker grows our skin.