Let me think, what have I heard that prisoners do?
In the first place they try to escape; and some have escaped from places as difficult as Loches.

Well, that is one thing to be thought very seriously about.

In the next place, I have heard of their making pets of spiders and all sorts of things.

Well, I may come to that, but at present I don't like spiders well enough to make pets of them; besides I don't see any spiders to make pets of.

Then some prisoners have carved walls, but I have no taste for carving.
"I might keep my muscles in order and my health good by exercise with the chair and table; get to hold them out at arm's length, lift the table with one hand, and so on.