Dull faces here, there,--in how many places! I don't say dull PEOPLE, but faces without a ray of sympathy or a movement of expression.

They are what kill the lecturer.

These negative faces with their vacuous eyes and stony lineaments pump and suck the warm soul out of him;--that is the chief reason why lecturers grow so pale before the season is over.
They render LATENT any amount of vital caloric; they act on our minds as those cold-blooded creatures I was talking about act on our hearts.
Out of all these inevitable elements the audience is generated,--a great compound vertebrate, as much like fifty others you have seen as any two mammals of the same species are like each other.

Each audience laughs, and each cries, in just the same places of your lecture; that is, if you make one laugh or cry, you make all.

Even those little indescribable movements which a lecturer takes cognizance of, just as a driver notices his horse's cocking his ears, are sure to come in exactly the same place of your lecture always.