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His eyes are deep-set and uncommonly circular; when he stretches them into surprise—often in accompaniment of a spiked tetrasyllable like “ri-di-cu-lous,” or “pre-pos-ter-ous,” or “Max Kel-ler-man”—they are perfect O’s.

Tetrasyllable, tet′ra-sil-a-bl, n. a word of four syllables.—adjs.

"One is monosyllabic, the other tetrasyllable," Spindrift begins.

Each line ends with a trisyllable or a tetrasyllable, with dissyllabic rhyme running through the quatrain.