Snarks cut in. I know all about that sort of thing! And I can tell a demon from a phantom as well as the next magical creature! Yes, the Brownie replied. But did you? Listen, short stuff! Snarks was shouting now.

Trying to tune in on your own face color is a bit like that: a twiddle too red, a twiddle too pale,

Psht! cat! You'll burn yourself, said the tailor.

In this context, it is worth remark that Sir Brian should have paid particular attention to the importance of a reserve of power in locomotives. He adverted to this in a discussion of punctuality, making first the highly debatable assertion that a very high proportion of steam locomotives today were being worked to the limit of their capacity, with little or no reserve in hand, ….