Nor give our faith to loose conjectures thus;
For in our art we only can depend
On actual practice and experiment.
Having no fix'd and settled laws by which
We may be govern'd, we must frame our own,
As time and opportunity may serve,
Which if we do not well improve, the art
Itself must suffer by our negligence.
B. You are indeed a most renown'd professor;
But still you have omitted to point out