It is a humor book. Every audience has a different temperature, and that makes a lecture go differently before every audience. The kind of an audience is just as important as the kind of a lecture. A cold audience will make a good lecture poor, while a warm audience will make a poor lecture good. When I was a boy we had a barrel of sorghum in the woodshed. When mother wanted to make ginger-bread or cookies, she would send me to the woodshed to get a bucket of sorghum from that barrel. Some warm September day I would pull the plug from the barrel and the sorghum would fairly squirt into my bucket. Later in the fall when it was colder, I would pull the plug but the sorghum would not squirt. It would come out slowly and reluctantly, so that I would have to wait a long while to get a little sorghum. And on some real cold winter day I would pull the plug, but the sorghum would not run at all. It would just look out at me.