Silence settled down upon them, broken occasionally by a murmur of this sort: “Ptolemy I was followed by a series of monarchs—by a series of monarchs—what are you going to wear, Dotsie?”

“That old brown gingham—the cube root of xy—364/2—”

Dolly burst into laughter. “X square plus seven X plus fifty-three equals eleven thirds!” she quoted.

Dotty laughed back and quoted their favourite “Hunting of the Snark.”

“Taking three as the number to reason about —

A convenient number to state —

We add Seven and Ten and then multiply out

By One Thousand diminished by Eight.

The result we proceed to divide, as you see,

By Nine Hundred and Ninety and Two: