--I dare not mention the name of the instrument in this place; --'tis sufficient we have it amongst us, --but never think of making a drawing by it; --this is nigmatical, and intended to be so, at least _ad populum_: --And therefore, I beg, Madam, when you come here, that you read on as fast as you can, and never stop to make any inquiry about it.

I dare not mention the name of the instrument; it's enough that we have it amongst us. -This is enigmatical, and intended to be so. I beg, Madam, that you read on as fast as you can, and do not stop to inquire about it.
