The Doctor's Prescription

A purse, a purse, for better or worse,
Indeed, would you know it, I've married a purse.
My wife's little daughter once fell very ill,
And we called for a doctor to give her a pill;
He wrote a prescription which now we will give her,
In which he has ordered a mosquito's liver,
And then in addition the heart of a flea,
And half pound of fly wings to make her some tea.