Naughty Victorian Handbook: Dobbin's Dream

I FOUND THIS BOOK AT HALF-PRICE BOOKS a couple of years ago. It's irresistible.

Dobbin's Dream or Tremor Exquisitus.
This exposure may be considerably invigorated by forward and backward movement of the thumb knuckle under the index finger. Such movement nicely replicates the riding motion in a manner most gratifying to the eye.