Point = part of figure.
Oh yes! = letter or piece of paper.
Most certainly = coin, other than money.
Yes, if you like = a watch.
This is harder = some trinket.
I am afraid this is harder = a ring.
An excellent idea = a playing card.
As an example of how this code can be employed, it may be imagined that the Professor lays his hand casually upon a gentleman’s coat-sleeve.
Prof.—What am I touching?
Mlle.—A part of some one’s clothing.