[a] The Tachypomp. (Scribner's Magazine, March 1874) Furnace, a rather unscholarly student, would like to marry Abscissa, daughter of mathematics professor Surd. The professor, who scorns non-mathematicians, caustically sets Furnace a nearly impossible task as a condition for his consent. Furnace must devise a system for attaining a speed of sixty miles per minute.
# Furnace goes to his friend and tutor, the eccentric Rivarol, who declares the problem easy: One simply places moving trains piggyback atop one another, adding their velocities until the professor's requirement is met.
# As Furnace dashes out to arrange funding, he stumbles into a trap that Rivarol maintains for bill collectors. This is an opening into a tunnel that passes through the center of the earth. He might oscillate back and forth indefinitely before settling at the center of the earth.
* But it is all a dream. He fell asleep while awaiting the professor, who, to Furnace's surprise, readily gives his consent to the marriage.
* Miscellaneous point: Rivarol is concerned with perpetual motion.
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